If you don't mind paying for it, Postbox (http://www.postbox-inc.com/ http://www.postbox-inc.com/) does support this feature. That said, I find it quite annoyi

If you don't mind paying for it, Postbox (http://www.postbox-inc.com/ http://www.postbox-inc.com/) does support this feature. That said, I find it quite annoying. I know this sounds crazy, but the only non-Gmail chat client I like is the one that comes with Opera. It's every feature of Gmail except conversations--which, annoying, is the one that I also badly wish I had.