It's a pretty neat program for gamers, and has some nice features built in for MMO players like us. In case you've never heard of it it's a chat client like AIM, but much more robust with a lot of cool stuff. For example, you can chat to your friends while you're in game without having to minimize (the IMs will pop up over your game without messing it up at all!) Also tracks how long you've played each game, and has a nifty miniprofile thingy!
Check it out, www.xfire.com, I've used it ever since someone told me about it.