diff --git a/History.txt b/History.txt
index ef9a75ee..d0091fd0 100644
--- a/History.txt
+++ b/History.txt
@@ -1,6 +1,9 @@
 == HEAD
   * Major Enhancements
     * Add command line importer functionality (#253)
+    * Add Redcarpet Markdown support (#318)
+    * Make markdown/textile extensions configurable (#312)
+    * Add `markdownify` filter
   * Minor Enhancements
     * Switch to Albino gem
     * Bundler support
diff --git a/bin/jekyll b/bin/jekyll
index 753eedad..2e33f377 100755
--- a/bin/jekyll
+++ b/bin/jekyll
@@ -82,6 +82,10 @@ opts = OptionParser.new do |opts|
   opts.on("--rdiscount", "Use rdiscount gem for Markdown") do
     options['markdown'] = 'rdiscount'
   end
+  
+  opts.on("--redcarpet", "Use redcarpet gem for Markdown") do
+    options['markdown'] = 'redcarpet'
+  end
 
   opts.on("--kramdown", "Use kramdown gem for Markdown") do
     options['markdown'] = 'kramdown'
diff --git a/features/site_configuration.feature b/features/site_configuration.feature
index 0681c2f5..8d3bee5d 100644
--- a/features/site_configuration.feature
+++ b/features/site_configuration.feature
@@ -55,6 +55,13 @@ Feature: Site configuration
     Then the _site directory should exist
     And I should see "<a href="http://google.com">Google</a>" in "_site/index.html"
 
+  Scenario: Use Redcarpet for markup
+    Given I have an "index.markdown" page that contains "[Google](http://google.com)"
+    And I have a configuration file with "markdown" set to "redcarpet"
+    When I run jekyll
+    Then the _site directory should exist
+    And I should see "<a href="http://google.com">Google</a>" in "_site/index.html"
+
   Scenario: Use Maruku for markup
     Given I have an "index.markdown" page that contains "[Google](http://google.com)"
     And I have a configuration file with "markdown" set to "maruku"
diff --git a/jekyll.gemspec b/jekyll.gemspec
index 2b2efdba..d23bd192 100644
--- a/jekyll.gemspec
+++ b/jekyll.gemspec
@@ -5,7 +5,7 @@ Gem::Specification.new do |s|
 
   s.name              = 'jekyll'
   s.version           = '0.10.0'
-  s.date              = '2010-12-16'
+  s.date              = '2011-05-30'
   s.rubyforge_project = 'jekyll'
 
   s.summary     = "A simple, blog aware, static site generator."
@@ -32,12 +32,14 @@ Gem::Specification.new do |s|
   s.add_development_dependency('redgreen', ">= 1.2.2")
   s.add_development_dependency('shoulda', ">= 2.11.3")
   s.add_development_dependency('rr', ">= 1.0.2")
-  s.add_development_dependency('cucumber', ">= 0.10.0")
+  s.add_development_dependency('cucumber', ">= 0.10.3")
   s.add_development_dependency('RedCloth', ">= 4.2.1")
   s.add_development_dependency('rdiscount', ">= 1.6.5")
-
+  s.add_development_dependency('redcarpet', ">= 1.9.0")
+  
   # = MANIFEST =
   s.files = %w[
+    Gemfile
     History.txt
     LICENSE
     README.textile
@@ -56,7 +58,6 @@ Gem::Specification.new do |s|
     features/support/env.rb
     jekyll.gemspec
     lib/jekyll.rb
-    lib/jekyll/albino.rb
     lib/jekyll/converter.rb
     lib/jekyll/converters/identity.rb
     lib/jekyll/converters/markdown.rb
@@ -70,13 +71,16 @@ Gem::Specification.new do |s|
     lib/jekyll/layout.rb
     lib/jekyll/migrators/csv.rb
     lib/jekyll/migrators/drupal.rb
+    lib/jekyll/migrators/enki.rb
     lib/jekyll/migrators/marley.rb
     lib/jekyll/migrators/mephisto.rb
     lib/jekyll/migrators/mt.rb
+    lib/jekyll/migrators/posterous.rb
     lib/jekyll/migrators/textpattern.rb
+    lib/jekyll/migrators/tumblr.rb
     lib/jekyll/migrators/typo.rb
-    lib/jekyll/migrators/wordpress.com.rb
     lib/jekyll/migrators/wordpress.rb
+    lib/jekyll/migrators/wordpressdotcom.rb
     lib/jekyll/page.rb
     lib/jekyll/plugin.rb
     lib/jekyll/post.rb
@@ -132,6 +136,7 @@ Gem::Specification.new do |s|
     test/test_pager.rb
     test/test_post.rb
     test/test_rdiscount.rb
+    test/test_redcarpet.rb
     test/test_site.rb
     test/test_tags.rb
     test/test_redcloth.rb
diff --git a/lib/jekyll.rb b/lib/jekyll.rb
index 3ffc36b4..9ff0ce7d 100644
--- a/lib/jekyll.rb
+++ b/lib/jekyll.rb
@@ -65,6 +65,9 @@ module Jekyll
     'pygments'     => false,
     'markdown'     => 'maruku',
     'permalink'    => 'date',
+    
+    'markdown_ext' => 'markdown,mkd,mkdn,md',
+    'textile_ext'  => 'textile',
 
     'maruku'       => {
       'use_tex'    => false,
@@ -76,6 +79,9 @@ module Jekyll
     'rdiscount'    => {
       'extensions' => []
     },
+    'redcarpet'    => {
+      'extensions' => []
+    },
     'kramdown'        => {
       'auto_ids'      => true,
       'footnote_nr'   => 1,
diff --git a/lib/jekyll/converters/markdown.rb b/lib/jekyll/converters/markdown.rb
index 00c56d7c..b5655476 100644
--- a/lib/jekyll/converters/markdown.rb
+++ b/lib/jekyll/converters/markdown.rb
@@ -10,6 +10,15 @@ module Jekyll
       return if @setup
       # Set the Markdown interpreter (and Maruku self.config, if necessary)
       case @config['markdown']
+        when 'redcarpet'
+          begin
+            require 'redcarpet'
+            @redcarpet_extensions = @config['redcarpet']['extensions'].map { |e| e.to_sym }
+          rescue LoadError
+            STDERR.puts 'You are missing a library required for Markdown. Please run:'
+            STDERR.puts '  $ [sudo] gem install redcarpet'
+            raise FatalException.new("Missing dependency: redcarpet")
+          end
         when 'kramdown'
           begin
             require 'kramdown'
@@ -65,9 +74,10 @@ module Jekyll
       end
       @setup = true
     end
-
+    
     def matches(ext)
-      ext =~ /(markdown|mkdn?|md)/i
+      rgx = '(' + @config['markdown_ext'].gsub(',','|') +')'
+      ext =~ Regexp.new(rgx, Regexp::IGNORECASE)
     end
 
     def output_ext(ext)
@@ -77,6 +87,8 @@ module Jekyll
     def convert(content)
       setup
       case @config['markdown']
+        when 'redcarpet'
+          Redcarpet.new(content, *@redcarpet_extensions).to_html
         when 'kramdown'
           # Check for use of coderay
           if @config['kramdown']['use_coderay']
diff --git a/lib/jekyll/converters/textile.rb b/lib/jekyll/converters/textile.rb
index 347ab197..6433dbb5 100644
--- a/lib/jekyll/converters/textile.rb
+++ b/lib/jekyll/converters/textile.rb
@@ -17,7 +17,8 @@ module Jekyll
     end
 
     def matches(ext)
-      ext =~ /textile/i
+      rgx = '(' + @config['textile_ext'].gsub(',','|') +')'
+      ext =~ Regexp.new(rgx, Regexp::IGNORECASE)
     end
 
     def output_ext(ext)
diff --git a/lib/jekyll/convertible.rb b/lib/jekyll/convertible.rb
index 1723fa0d..46dbfea1 100644
--- a/lib/jekyll/convertible.rb
+++ b/lib/jekyll/convertible.rb
@@ -1,3 +1,5 @@
+require 'set'
+
 # Convertible provides methods for converting a pagelike item
 # from a certain type of markup into actual content
 #
@@ -86,6 +88,8 @@ module Jekyll
 
       # recursively render layouts
       layout = layouts[self.data["layout"]]
+      used = Set.new([layout])
+
       while layout
         payload = payload.deep_merge({"content" => self.output, "page" => layout.data})
 
@@ -95,7 +99,13 @@ module Jekyll
           puts "Liquid Exception: #{e.message} in #{self.data["layout"]}"
         end
 
-        layout = layouts[layout.data["layout"]]
+        if layout = layouts[layout.data["layout"]]
+          if used.include?(layout)
+            layout = nil # avoid recursive chain
+          else
+            used << layout
+          end
+        end
       end
     end
   end
diff --git a/lib/jekyll/filters.rb b/lib/jekyll/filters.rb
index dbd9f511..eb61d84a 100644
--- a/lib/jekyll/filters.rb
+++ b/lib/jekyll/filters.rb
@@ -9,7 +9,20 @@ module Jekyll
     #
     # Returns the HTML formatted String.
     def textilize(input)
-      TextileConverter.new.convert(input)
+      site = @context.registers[:site]
+      converter = site.getConverterImpl(Jekyll::TextileConverter)
+      converter.convert(input)
+    end
+
+    # Convert a Markdown string into HTML output.
+    #
+    # input - The Markdown String to convert.
+    #
+    # Returns the HTML formatted String.
+    def markdownify(input)
+      site = @context.registers[:site]
+      converter = site.getConverterImpl(Jekyll::MarkdownConverter)
+      converter.convert(input)
     end
 
     # Format a date in short format e.g. "27 Jan 2011".
diff --git a/lib/jekyll/migrators/tumblr.rb b/lib/jekyll/migrators/tumblr.rb
index 0345b4a9..d7cb3969 100644
--- a/lib/jekyll/migrators/tumblr.rb
+++ b/lib/jekyll/migrators/tumblr.rb
@@ -65,7 +65,7 @@ module Jekyll
               content << "<dt>" + line['label'] + "</dt><dd>" + line.inner_html + "</dd>" unless line['label'] == nil || line == nil
             end
 
-            content << "<section><dialog>"
+            content << "</section></dialog>"
           elsif post['type'] == "video"
             title = post.at("video-title").inner_html unless post.at("video-title") == nil
             content = CGI::unescapeHTML(post.at("video-player").inner_html)
diff --git a/lib/jekyll/migrators/typo.rb b/lib/jekyll/migrators/typo.rb
index 3de5130a..adb8be96 100644
--- a/lib/jekyll/migrators/typo.rb
+++ b/lib/jekyll/migrators/typo.rb
@@ -2,6 +2,7 @@
 require 'fileutils'
 require 'rubygems'
 require 'sequel'
+require 'yaml'
 
 module Jekyll
   module Typo
@@ -24,7 +25,7 @@ module Jekyll
       FileUtils.mkdir_p '_posts'
       db = Sequel.mysql(dbname, :user => user, :password => pass, :host => host, :encoding => 'utf8')
       db[SQL].each do |post|
-        next unless post[:state] =~ /Published/
+        next unless post[:state] =~ /published/
 
         name = [ sprintf("%.04d", post[:date].year),
                  sprintf("%.02d", post[:date].month),
diff --git a/lib/jekyll/page.rb b/lib/jekyll/page.rb
index a4a0f9f3..82b82048 100644
--- a/lib/jekyll/page.rb
+++ b/lib/jekyll/page.rb
@@ -3,8 +3,9 @@ module Jekyll
   class Page
     include Convertible
 
+    attr_writer :dir
     attr_accessor :site, :pager
-    attr_accessor :name, :ext, :basename, :dir
+    attr_accessor :name, :ext, :basename
     attr_accessor :data, :content, :output
 
     # Initialize a new Page.
diff --git a/lib/jekyll/plugin.rb b/lib/jekyll/plugin.rb
index 208472f0..600f326d 100644
--- a/lib/jekyll/plugin.rb
+++ b/lib/jekyll/plugin.rb
@@ -34,6 +34,7 @@ module Jekyll
     #
     # Returns the Symbol priority.
     def self.priority(priority = nil)
+      @priority ||= nil
       if priority && PRIORITIES.has_key?(priority)
         @priority = priority
       end
diff --git a/lib/jekyll/site.rb b/lib/jekyll/site.rb
index 41905d65..9c24f8e4 100644
--- a/lib/jekyll/site.rb
+++ b/lib/jekyll/site.rb
@@ -266,7 +266,7 @@ module Jekyll
     def post_attr_hash(post_attr)
       # Build a hash map based on the specified post attribute ( post attr =>
       # array of posts ) then sort each array in reverse order.
-      hash = Hash.new { |hash, key| hash[key] = Array.new }
+      hash = Hash.new { |hsh, key| hsh[key] = Array.new }
       self.posts.each { |p| p.send(post_attr.to_sym).each { |t| hash[t] << p } }
       hash.values.map { |sortme| sortme.sort! { |a, b| b <=> a } }
       hash
@@ -314,5 +314,18 @@ module Jekyll
       end
     end
 
+    # Get the implementation class for the given Converter.
+    #
+    # klass - The Class of the Converter to fetch.
+    #
+    # Returns the Converter instance implementing the given Converter.
+    def getConverterImpl(klass)
+      matches = self.converters.select { |c| c.class == klass }
+      if impl = matches.first
+        impl
+      else
+        raise "Converter implementation not found for #{klass}"
+      end
+    end
   end
 end
diff --git a/test/helper.rb b/test/helper.rb
index 6ee3f7a4..c6a8a763 100644
--- a/test/helper.rb
+++ b/test/helper.rb
@@ -6,12 +6,12 @@ require 'jekyll'
 require 'RedCloth'
 require 'rdiscount'
 require 'kramdown'
+require 'redcarpet'
 
 require 'redgreen' if RUBY_VERSION < '1.9'
 require 'shoulda'
 require 'rr'
 
-
 include Jekyll
 
 # Send STDERR into the void to suppress program output messages
diff --git a/test/source/_posts/2011-04-12-md-extension.md b/test/source/_posts/2011-04-12-md-extension.md
new file mode 100644
index 00000000..163e9133
--- /dev/null
+++ b/test/source/_posts/2011-04-12-md-extension.md
@@ -0,0 +1,7 @@
+---
+date: 2011-04-12 13:07:09
+---
+
+under default configuration, this post should get processed by the identity converter. By changing 
+textile extension or markdown extension configuration parameters, you should be able to associate
+it with either of those converters
\ No newline at end of file
diff --git a/test/source/_posts/2011-04-12-text-extension.text b/test/source/_posts/2011-04-12-text-extension.text
new file mode 100644
index 00000000..e69de29b
diff --git a/test/test_filters.rb b/test/test_filters.rb
index 4fa0b819..205d4bca 100644
--- a/test/test_filters.rb
+++ b/test/test_filters.rb
@@ -3,6 +3,11 @@ require 'helper'
 class TestFilters < Test::Unit::TestCase
   class JekyllFilter
     include Jekyll::Filters
+
+    def initialize
+      site = Jekyll::Site.new(Jekyll.configuration({}))
+      @context = Liquid::Context.new({}, {}, { :site => site })
+    end
   end
 
   context "filters" do
@@ -14,6 +19,10 @@ class TestFilters < Test::Unit::TestCase
       assert_equal "<p>something <strong>really</strong> simple</p>", @filter.textilize("something *really* simple")
     end
 
+    should "markdownify with simple string" do
+      assert_equal "<p>something <strong>really</strong> simple</p>", @filter.markdownify("something **really** simple")
+    end
+
     should "convert array to sentence string with no args" do
       assert_equal "", @filter.array_to_sentence_string([])
     end
diff --git a/test/test_generated_site.rb b/test/test_generated_site.rb
index c7087031..9fb7a409 100644
--- a/test/test_generated_site.rb
+++ b/test/test_generated_site.rb
@@ -14,7 +14,7 @@ class TestGeneratedSite < Test::Unit::TestCase
     end
 
     should "ensure post count is as expected" do
-      assert_equal 26, @site.posts.size
+      assert_equal 28, @site.posts.size
     end
 
     should "insert site.posts into the index" do
diff --git a/test/test_post.rb b/test/test_post.rb
index 323ab7dc..1c3ea641 100644
--- a/test/test_post.rb
+++ b/test/test_post.rb
@@ -397,6 +397,47 @@ class TestPost < Test::Unit::TestCase
       post = Post.new(@site, File.join(File.dirname(__FILE__), *%w[source]), 'foo', 'bar/2008-12-12-topical-post.textile')
       assert_equal ['foo'], post.categories
     end
-
   end
+  
+  context "converter file extension settings" do
+    setup do
+      stub(Jekyll).configuration { Jekyll::DEFAULTS }
+      @site = Site.new(Jekyll.configuration)
+    end
+    
+    should "process .md as markdown under default configuration" do
+      post = setup_post '2011-04-12-md-extension.md'
+      conv = post.converter
+      assert conv.kind_of? Jekyll::MarkdownConverter
+    end
+    
+    should "process .text as indentity under default configuration" do
+      post = setup_post '2011-04-12-text-extension.text'
+      conv = post.converter
+      assert conv.kind_of? Jekyll::IdentityConverter
+    end
+    
+    should "process .text as markdown under alternate configuration" do
+      @site.config['markdown_ext'] = 'markdown,mdw,mdwn,md,text'
+      post = setup_post '2011-04-12-text-extension.text'
+      conv = post.converter
+      assert conv.kind_of? Jekyll::MarkdownConverter
+    end
+    
+    should "process .md as markdown under alternate configuration" do
+      @site.config['markdown_ext'] = 'markdown,mkd,mkdn,md,text'
+      post = setup_post '2011-04-12-text-extension.text'
+      conv = post.converter
+      assert conv.kind_of? Jekyll::MarkdownConverter
+    end
+    
+    should "process .text as textile under alternate configuration" do
+      @site.config['textile_ext'] = 'textile,text'
+      post = setup_post '2011-04-12-text-extension.text'
+      conv = post.converter
+      assert conv.kind_of? Jekyll::TextileConverter
+    end
+    
+  end
+  
 end
diff --git a/test/test_redcarpet.rb b/test/test_redcarpet.rb
new file mode 100644
index 00000000..1359c449
--- /dev/null
+++ b/test/test_redcarpet.rb
@@ -0,0 +1,21 @@
+require File.dirname(__FILE__) + '/helper'
+
+class TestRedcarpet < Test::Unit::TestCase
+  context "redcarpet" do
+    setup do
+      config = {
+        'redcarpet' => { 'extensions' => ['smart'] },
+        'markdown' => 'redcarpet'
+      }
+      @markdown = MarkdownConverter.new config
+    end
+
+    should "pass redcarpet options" do
+      assert_equal "<h1>Some Header</h1>", @markdown.convert('# Some Header #').strip
+    end
+    
+    should "pass redcarpet extensions" do
+      assert_equal "<p>&ldquo;smart&rdquo;</p>", @markdown.convert('"smart"').strip
+    end
+  end
+end
diff --git a/test/test_tags.rb b/test/test_tags.rb
index ba3d0d3e..50750757 100644
--- a/test/test_tags.rb
+++ b/test/test_tags.rb
@@ -125,5 +125,16 @@ CONTENT
         assert_match %r{<em>FINISH HIM</em>}, @result
       end
     end
+    
+    context "using Redcarpet" do
+      setup do
+        create_post(@content, 'markdown' => 'redcarpet')
+      end
+
+      should "parse correctly" do
+        assert_match %r{<em>FIGHT!</em>}, @result
+        assert_match %r{<em>FINISH HIM</em>}, @result
+      end
+    end
   end
 end