I was going to whine about GoogleTalk invites that I got. Three people invited me and when I read the invite it says that the client is windows only.
But on the GoogleTalk site there are indications that the protocol used is Jabber. And in the Help Center link (they really should put this information on the main site) there's a link to How to install GoogleTalk on Gaim. So I'm happy. I don't have the voice chat features of GoogleTalk. I wish I did. I'll probably figure that out at some point. Particularly since I've now got lots of bandwidth, enough for voice chat or video. But I'll do that some months in the future. I don't have a headset and mic setup and I just don't have the time to deal with that right now.