I put together a little Spotlight plug-in that imports metadata from Ruby scripts. It imports module, class, and method names, as well as comments and the plain text of Ruby scripts. I've been using it for a while now, and I thought it might come in handy for other Ruby coders using OS X. Feedback is welcome!
[robg adds: I haven't tested this one...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=2005060302082243