The windows version of AOL IM (or the beta version at least) has suppost for ICQ so that AOL users can send I'm's to ICQ users and add them to their friends list. AOL and ICQ are the same company. iChat is a AOL: compatible client so thus there is a good chance apple will add ICQ compatibility in the next update. I personally would like them to also add compatibility for Jabba also as this shouldn't be difficult with it being an open source project. As far as I know it would just involve Apple setting up a Jabba compatible server and adding the Jabba source code though I don't know too much about it.