You could also try GitHub - parolkar/pfeed: A rails plugin that allows you to create extensible log of activity
Explanation here : http://www.travisdunn.com/activity-logs-and-friend-feeds-on-rails-pfeed
This was in reply to http://groups.google.com/group/rubyonrails-talk/browse_thread/thread/3ccb0cd6684d7836?pli=1