blog.rb

class Blog
  require 'open-uri'
  require 'rss'

  def self.latest
    @blog ||= load_blog
  end

protected

  def self.load_blog
    url = "your_blog.com/rss.xml"
    # Variable for storing feed content
    rss_content = ""
    # Read the feed into rss_content
    open(url) do |f|
      rss_content = f.read
    end
    # Parse the feed, dumping its contents to rss
    @blog = RSS::Parser.parse(rss_content, false).items.first.description
  end

end