I get asked whether I know anyone who is available for Ruby gigs quite regularly - and the answer is almost always 'not at the moment' - but I'm not a definitive source! The recommendations I always have for potential Rubyist employers/clients are:
Attend a Melbourne Ruby presentations night - they're always on the last Wednesday of the month, excluding December. These are the most social events (hack nights and InstallFests are a bit more studious), so they're the best opportunity to meet Rubyists face to face. There's also the opportunity to give a short (10-30 seconds) pitch for anyone who's hiring early in the evening (but stick around after that, so people can find you and chat further!).
There are also always a few recruiters at these events - perhaps it's worth having a chat with them too? The fact that they attend events is a good sign that they're engaged with the community.