Yeah, I use MSN.
I think that they should produce one we can all talk on though, that are reliable, and allows for all features to be used from all chat programs (Unlike Trillian). Then, it wont be unfair.
I've always used MSN though, and won't switch since all the people I talk to have MSN, and haven't had any people say to me "I can't add you because I use AIM" or something.