Gush 1.2 was recently released. (Did I mention that Gush is the most gorgeous IM app?). Mostly this release focused on PubSub integration, but the 2.0 features look mighty nice. The Conversation Gems feature, pulling out and highlighting things like phone numbers, sounds interesting.
Currently there are only two extremely minor nits I have about Gush. One, I can't get it to work on my Linux box (I admit I haven't tried very hard). Two, no plugin architecture.