Ryan Daigle writes about resource_feeder, a new plugin for Ruby on Rails that makes the generation of RSS and Atom feeds easy. Like so:

def 
                  rss
  render_rss_feed_for Post
                  .
                  find
                  (
                  :all
                  , :order => '
                  created_at DESC
                  ', :limit => 10
                  )
end

If you want to get playing straight away:

script/plugin install simply_helpful
script/plugin install resource_feeder

Feedalizer is a Ruby library that lets you easily scrape Web pages and convert them into RSS feeds. Some demo code that generates a feed:

require "
                  feedalizer
                  "
require "
                  time
                  "

url = "
                  http://sydsvenskan.se/serier/nemi/article101047.ece?context=serie
                  "

feedalize
                  (
                  url
                  ) do
  feed
                  .
                  title = "
                  Nemi
                  "
  feed
                  .
                  about = "
                  ...
                  "
  feed
                  .
                  description = "
                  Daily Nemi strip scraped from Sydsvenskan
                  "

  scrape_items
                  ("
                  option
                  ") do |
                  rss_item
                  , html_element
                  |
    rss_item
                  .
                  link  = html_element
                  .
                  attributes
                  ["
                  value
                  "]
    rss_item
                  .
                  date  = Time
                  .
                  parse
                  (
                  html_element
                  .
                  innerHTML
                  )
    rss_item
                  .
                  title = rss_item
                  .
                  date
                  .
                  strftime
                  ("
                  %Y-%m-%d
                  ")

    # This grabs the page for a particular strip and extracts the relevant img element
    rss_item
                  .
                  description = grab_page
                  (
                  rss_item
                  .
                  link
                  ).
                  search
                  ("
                  //img[@width=748]
                  ")
  end

  output!
end