Meebo
Been looking for an Instant Messenger (IM) client that allows you to chat with almost anyone? Don’t want to download a software client because it’s a pain for your Hard Disk Drive? Then it’s time for you to try out meebo.
Meebo is an instant messaging software that runs inside a Web browser, as AIM Express, which supports multiple IM services, including Yahoo! Messenger, Windows Live Messenger, AIM, ICQ, Jabber and Google Talk. Meebo makes instant messaging services more accessible to users who are unable or unwilling to download the software necessary to implement them.
It also allows you to change wallpapers and create your own private rooms. Unfortunately, it can’t do features of Yahoo and others for obvious reasons. But still, if you like plain old chatting without of the other frills then meebo is the right one for you.