I've actually been thinking... what about a PB TinyChat room? For those unfamiliar with the site, it allows you to create a chat room where various users can speak to one another live via webcam/microphone. You can also simply chat via text, a la a standard chat room. Here's a little example:
[video=youtube;TaBlw-nMFbE]http://www.youtube.com/watch?v=TaBlw-nMFbE[/video]
That site has so much unused potential. Currently, seemingly 99% of rooms are devoted to either Justin Bieber, hip-hop music/culture, or marijuana. Kids these days. But I have seen companies use it for video conferencing, etc. I and some fellow students at university used it occasionally for study meetings.
The highest privacy settings, of course, would have to be put in place for the room.