I have AIM, MSN, and Yahoo.

I'm pretty much on AIM anytime my computer is on, MSN is occasional because I don't really have anyone to talk to specifically on there, so I don't really bother with it. But I still log on every once and awhile to see what's up. Yahoo is pretty much a never, but still available as a backup in case something goes wrong with AIM.

None of them are my favorite as they all suck.