One Computer + Virtualization + (four)keyboards + (four) Monitors = ?

Has anyone used Microsoft Server 2008, or any other OS that allows virtualization along with multiple keyboards, mice, and monitors?

I’m thinking about multiple users using one machine.

I have seen these links but wondered if anyone had something more current:
http://www.networktechinc.com/kmspltpc.html
http://linuxgazette.net/124/smith.html