Here’s another web-based IM client – imo.im. The service runs on Lighttpd, Pidgin (formerly Gaim), Ubuntu, and YUI. They have a blog here and looks like they’re the same guys running Aryty of Gorilla Mobile.
If you go to that page, a Certificate Authority window will po-up which is kinda annoying. I then tried to log in to all the 4 IMs supported — YM, AOL, GTalk and MSN. However, I got confused a bit since there’s only one buddy list showing up on the page and it’s a little hard to identify which IM is which contact you are looking though I think the icons beside the handles would indicate that.
My biggest wish for such web apps — individual IM settings panel which allows me start-up or login settings. I would appreciate it if I could set my status to invisible at login.