Chat at AIM, Yahoo, Gtalk and MSN in single window!!!

Meebo:

Meebo is a web application that enables you to chat with your MSN, AOL, Gtalk and Yahoo buddies without having to install any program or Java applet.

Click On http://www28.meebo.com/

E-Messenger:

E-Messenger is a web application that enables you to chat with your MSN, AOL and Yahoo buddies without having to install any program or Java applet.

Click On http://www.e-messenger.net/