What makes Jabber a killer in the IM realm is the gateway modules. The gateways let send messages to pretty much any of the other IM servers. Aol, ICQ, MSN, and others I'm sure.
Anyhow, I think chatrooms and stuff would be cool and all, but the most straight forward thing to roll into the ACS would be IM notification. Select what flavor you use, and your screen name and bam! a message with a url to the forum, ticket, or whatever.
Thoughts?
