Ben, I would strongly recommend that you consider using Jabber or some other third-party chat system rather than the ACS chat module. The old ACS chat client is terrible, and the new one is untested while being only marginally better. Plus, nobody within the OpenACS community has (publicly) expressed any interest in working on the ACS chat module. The only conversations that have come up around chat have been about integrating Jabber. Even ArsDigita is
considering dumping the chat module in favor of Jabber.
So you'd be working with a poor code base and (probably) without much community support.
