URL:

http://www.meebo.com

What is Meebo?

Meebo is a web based instant messenging service that allows you to use your existing instant messenger account with AIM, GTalk, Yahoo, MSN, IRC and more.  You can login, get your buddy list, and instant message away with having to download anything, just use your web browser.

What you may not know about Meebo

With Meebo, you can actually login to more than 1 account at a time.  This is a great to not having to install, say 3 IM clients on your computer and monitoring all there friends lists.  Log in to all of them simlutaneously with Meebo and chat it up with your friends.

Here’s a quick video on Meebo: