Also you might want to try building from svn, I've got some builds up on http://janeylicious.com/colloquy/ if you're interested.

Also if Colloquy isn't your thing, there's also LimeChat and Linkinus. I've got lots of bitching that Colloquy's a dead project (with commits from a day ago...) and people who decide to switch have found those two clients to be useful, although Linkinus is shareware.