Web-based Instant Messaging

Meebo provides web-based access to several instant messaging systems, including MSN, AIM/ICQ, Jabber/GTalk, and Yahoo Messenger.

The user interface is based on the so-called AJAX technologies, and is really quite slick. I'm not quite sure where they are going with this service though. I can't see how they are going to make money with this, although I imagine they could easily include some sort of advertising, targetted or otherwise. Anyway, I would definately recomend checking this out.