just switched from miranda->gaim. a tad bit more bloated, but a few features i missed from running the offical clients. plus, various *nixisms in the program make me smile as i'm running the windows port.
i also run xfire for gaming purposes. it's actualy a pretty clean program, uses less memory than any official chat client i've used in a long time. the local gaming center has a pretty sweet xfire setup where you add a bot to your friends list and you can see all of the other regulars playing. plus, they do "secret" free LAN parties where they give you less than 24hrs notice using xfire.
c: