A more generic import.rb that should work for any xml file if all you need is every "post" from your source. Use this to import posts to Jekyll!

import.rb

require 'rubygems'
require 'nokogiri'
require 'fileutils'
require 'date'
require 'reverse_markdown'

# usage: ruby import.rb feed.xml
# feed.xml is an file you can download from most websites that support RSS

data = File.read ARGV[0]
doc = Nokogiri::XML(data)

@posts = {}

def add(node)
  id = node.search('id').first.content
  type = node.search('category').first.attr('term').split('#').last
  if type='post'
    @posts[id] = Post.new(node)
  else
    puts "there is a tag named" +type # You can delete lines 20-22 without affecting the generated files.
  end
end

def write(post)
  puts "writing #{post.file_name}"
  File.open(File.join('_posts', post.file_name), 'w') do |file|
    file.write post.header
    file.write "\n\n"
    file.write post.content
  end
end

class Post
  def initialize(node)
    @node = node
  end

  def title
    @node.search('title').first.content
  end

  def content_html
    @node.search('content').first.content
  end

  def content
    ReverseMarkdown.convert content_html
  end

  def creation_date
    creation_datetime.strftime("%Y-%m-%d")
  end

  def creation_datetime
    Date.parse(@node.search('published').first.content)
  end

  def param_name
    title.split(/[^a-zA-Z0-9]+/).join('-')
  end

  def file_name
    %{#{creation_date}-#{param_name}.markdown}
  end

  def header
    [
      '---',
      %{layout: post},
      %{title: #{title}},
      %{date: #{creation_datetime}},
      '---'
    ].join("\n")
  end
end

entries = {}

doc.search('entry').each do |entry|
  add entry
end

FileUtils.rm_rf('_posts')
Dir.mkdir("_posts") unless File.directory?("_posts")

@posts.each do |id, post|
  write post
end