gistfile1.rb

module Feedzirra
  class AtomEntry
    include SAXMachine
    element :title
    # the :as argument makes this available through atom_entry.author instead of .name
    element :name, :as => :author
    element "feedburner:origLink", :as => :url
    element :summary
    element :content
    element :published
  end
  
  # Class for parsing Atom feeds
  class Atom
    include SAXMachine
    element :title
    # the :with argument means that you only match a link tag that has an attribute of :type => "text/html"
    # the :value argument means that instead of setting the value to the text between the tag,
    # it sets it to the attribute value of :href
    element :link, :value => :href, :as => :url, :with => {:type => "text/html"}
    element :link, :value => :href, :as => :feed_url, :with => {:type => "application/atom+xml"}
    elements :entry, :as => :entries, :class => AtomEntry
  end
end

# you can then parse like this
feed = Atom.parse(xml_text)
# then you're ready to rock
feed.title    # => whatever the title of the blog is
feed.url      # => the main url of the blog
feed.feed_url # => goes to the feedburner feed

feed.entries.first.title  # => title of the first entry
feed.entries.first.author # => the author of the first entry
feed.entries.first.url    # => the permalink on the blog for this entry
# etc ...