Lounge

I can see the advantage of separate urls, etc. but on CABWEB we had two sorts of spaces within one installation, generally open networks (with guest access) one for staff, one for students, and generally closed collaboration spaces where tutors organised international collaborations for students. It's pretty quiet there at present but you can still see the arrangement at http://www.cabweb.net
BTW, interesting discussion below about MySpace like arrangements.