Added meta tag import goodness. This for instance allows you to preserve all your hard-worked on WP SEO keywords, images, alternative images and other yummy-ness.

Replaced PubDate with wp:post_date, this is better than PubDate since some of the posts you import could be a draft (in this case the pubDate is invalid and contains a non-sensical value).
Added wp:status so we now know whether the post is published, draft or in the trash.
Added wp:post_type so we differentiate between posts and image or other post types

lib/jekyll/migrators/wordpressdotcom.rb

@@ -4,6 +4,7 @@ require 'rubygems'
 require 'hpricot'
 require 'fileutils'
 require 'yaml'
+require 'time'
 
 module Jekyll
   # This importer takes a wordpress.xml file, which can be exported from your
@@ -18,13 +19,26 @@ module Jekyll
       (doc/:channel/:item).each do |item|
         title = item.at(:title).inner_text.strip
         permalink_title = item.at('wp:post_name').inner_text
-        date = Time.parse(item.at(:pubDate).inner_text)
+        date = Time.parse(item.at('wp:post_date').inner_text)
+        status = item.at('wp:status').inner_text
+        type = item.at('wp:post_type').inner_text
         tags = (item/:category).map{|c| c.inner_text}.reject{|c| c == 'Uncategorized'}.uniq
+
+        metas = Hash.new
+        item.search("wp:postmeta").each do |meta|
+          key = meta.at('wp:meta_key').inner_text
+          value = meta.at('wp:meta_value').inner_text
+          metas[key] = value;
+        end
+
         name = "#{date.strftime('%Y-%m-%d')}-#{permalink_title}.html"
         header = {
           'layout' => 'post',
           'title'  => title,
-          'tags'   => tags
+          'tags'   => tags,
+          'status'   => status,
+          'type'   => type,
+          'meta'   => metas
         }
 
         File.open("_posts/#{name}", "w") do |f|