I can't tell you all the details yet. Basically anyone who is not firewalled can open up a chat room and others will be able to find that chat room through some kind of feature search (very much like the "What Is New" query).

The chat itself (as I envision it right now) is going to be a little like IRC, but I haven't even started with the graphical user interface.

I'm not sure how far I will pursue the idea, in theory, you could use the new UDP transfers to allow two firewalled users to communicate and to allow certain firewalled users to open chat rooms, - or you could have multiple nodes hosting a chat room for some super-large rooms with far more than 100 users but for now, all I want are simple chat rooms that you will find through searches.