Really enjoying the concept of this! A few friends of mine and I do JavaScript lessons over Google Hangout right now and this would be a much preferred alternative, although it doesn't seem to allow more than two people's cams at once.
I realize this is for interviews and there'd be no reason to have this unless you were potentially testing multiple candidates at once, but it would also be useful to us if we each had our own code environments that didn't interfere with the master source, but could be public or private to the others in the room. Just an idea. :)