Sometimes I sound like a cheerleader for Trillian. Well I should, it’s an awesome product. Have you tried it? It puts your AIM, MSN, and Yahoo buddy lists all in one user interface. But that’s not all, it also has ICQ and IRC added in. The Pro version (payment required) allows you to run an RSS reader, WinAmp, and even get email through the user interface.
But the real reason I like it, I can have several screen names running off the same user interface! That’s great if you have a specialized AIM account you use for one particular thing and you want to talk on your personal name too.