(Well, just off the bat, I have nothing do to the Meebo people, but when your in High School its a great website.)

http://www29.meebo.com
http://forum.meebo.com

Its a really great AIM program, because it has every type of IM client you can think of and it has a really nice design, clean and easy to use... and the Meebo feature that you can store all of you logins (different clients) and such under one meebo login name, now meebo does not have its own IM client it just lets you use others. As I said above the Meebo Login, lets you handel every screename you ever could own under one login so when you sign on, your signed on as all of those SN's. Its really great!