jobregator is a ruby and rails job aggregator, currently gathering jobs from following sources (and many more to come):
http://railswork.com http://www.opensourcexperts.com http://rubyrockstars.com http://www.railspays.com http://learningruby.jobcoin.com
And aggregate them as a single RSS feed: http://www.jobregator.com/jobs/feed.xml
You can also post your job on jobregator.com, it costs $30 for 30 days.
Cheers, - HCH