If you live in the Mountain West (Colorado, Arizona, Idaho, Nevada, and Utah), or don't mind a bit of travel, You should look into the 2007 MountainWest RubyConf in Salt Lake City, Utah on March 16th and 17th. We've got a great line up of speakers, including the JRuby team, Ara T Howard, and a keynote by Chad Fowler.
Registration is just $50, hotels are affordable, and pre/post conference skiing promises to be great too. What more can you ask for.
The only downside is that registration closed on Feb 23rd, and seats are limited. If you haven't registered yet, this is the time!
Come on out and join the fun.