Use this little script to serve an Atom feed about your git repo. I use it to show a rolling ticker on my Twitch.TV live dev streaming channel. See it in action here: http://twitch.tv/chrismdp_

rss_git_info.rb

#!/usr/bin/env ruby

require 'builder'
require 'sinatra'
require 'action_view'

include ActionView::Helpers::DateHelper

get '/' do
  date = Time.parse(`git show -s --format=%ci`.chomp)
  xml = Builder::XmlMarkup.new
  xml.instruct! :xml, :version => '1.1'
  xml.feed(:xmlns => "http://www.w3.org/2005/Atom") do
    xml.title "Git info"
    xml.link "http://localhost"
    xml.updated Time.now
    xml.id "http://soltrader.net/forums"
    xml.entry do
      xml.id "Last commit"
      xml.title "Last commit: #{`git show -s --format=%s`.chomp} (#{time_ago_in_words(date)} ago)"
    end
    xml.entry do
      xml.id "Changes"
      xml.title "Since last commit: #{`git diff HEAD --shortstat`.chomp}"
    end
    if (File.exist?("MESSAGES"))
      File.read("MESSAGES").lines.each_with_index do |line,i|
        xml.entry do
          xml.id "MSG#{i}"
          xml.title line
        end
      end
    end
  end
end