I'm currently on AIM, Gtalk, and Yahoo Messenger. I have Facebook and Myspace, but haven't used them much for IM. It's all getting a bit ridiculous though. Maybe I'll just use Meebo to consolidate....

 Meebo is a web-based chat client that lets you keep up with your AIM, Yahoo!, Google Talk, and Windows Live Messenger contacts. Now Meebo has rolled out support for two more chat clients: Facebook and MySpace.

The move makes sense, since Meebo's goal is to allow you to chat with all of your contacts in one space.

....

http://www.downloadsquad.com/2008/12/21/meebo-adds-facebook-myspace-im-to-its-web-based-chat-service/