Meebo is an Web-based instant messaging application that is simply superb. Meant for using as a web messenger and it surely does work great. Meebo allows you to log onto AOL, ICQ, Yahoo! Messenger, MSN Messenger, Jabber, eliminating the need for an instant-messaging client on the user’s computer.
Meebo was started by three young entrepreneurs who placed an emphasis on user-feedback in determining the direction of their business. Meebo launched a private release on September 4, 2005, and it was publicly released on September 14, 2005 and has had many major revisions since. It uses ajax and is another great example for Web 2.0. Simply superb and very fast interface.

It currently supports Internet Explorer 5.0+, FireFox, Safari, Slimbrowser, K-Meleon, and Camino. Although still in its early stages, the goal of the project is to combine the features of Trillian with the availability of AIM Express. Meebo includes the ability to sign on invisibly and to connect to multiple services.

If your Meebo is blocked at your school / office / workplace, try this link http://blog.meebo.com/?page_id=140 .

Meebo is a web based IM that lets you log into your IM networks from any computer with a browser and internet connection with no firewall issues. It employs technologies (like AJAX) to make it act more like a desktop application, which dramatically improves usability. Many users enjoy the benefits of a native DHTML application, as it does not consume as many system resources as a Java applet (such as ICQ2Go or Yahoo Web Messenger).

Some users are also experimenting with setting meebo as their Active Desktop page to use meebo like a native Windows application for their instant-messaging purposes.