ahh here's the link. I forgot how I'd found this page last week... it's under 'Chat' in that very top brown nav bar.
http://www.belltreeforums.com/chat.php
Mumble is a VOIP program... it's, admittedly, not very out-of-the-box... it's a bit fiddly to set up the first time. But after that, its pretty much the best one out there. Less b/w usage for the same quality than Ventrillo, or something. It's pretty neat that these forums have a mumble server, I've been a bit surprised peeps aren't in it more. Maybe that's just not a thing here tho X D.
Mostly I just really hate that little chatbox ;_; it's slow, I typo a lot, and when someone arrives or leaves it erases what I was writing, haha. But yeah, installing Mumble, if you haven't done it before, is probably not something you want to multitask if you're working on getting peeps in and out of your town X D.