Cheers for Adium
Thanks to Andy Abramson for posting in his blog about Adium, the multi-service IM client for Mac. I've recently installed it and found it to be a worthwhile addition to my Mac software collection. Adium supports most public IM networks including Yahoo, MSN, GoogleTalk, ICQ, .Mac, and AOL as well as services based on Jabber/XMPP, Sametime, and even Gadu-Gadu.
Unfortunately I haven't been able to get the Gizmo Project plug-in to work, it crashes the Adium client whenever it tries to connect to the Gizmo server. Hopefully the next release of the plug-in will fix the bug. It would also be nice to have the ability to do voice & video as well for services that support it. And of course, I'm anxiously awaiting a Skype plug-in so I can get rid of the Skype client on my desktop.