University of Illinois uses a Cluster for Immersive VR
It seems the folks down at the University of Illinois at Urbana-Champaign have created a 6-sided CAVE like system called ALICE. But, instead of running it off of a SGI Onyx, they've developed a distributed environment for visualization called Syzygy. Slap a few computers together and make your own holodeck!
The Cornell Theory Center (www.tc.cornell.edu)
has a 3-wall cave setup that uses 3 off the shelf dell workstations running w2k and software from vrco.com. Seems to Just Work; I played quake on it a couple months ago.
ISU has probably the premier researcher in this area, Dr. Carolina Cruz-Neira. Here's some info on the environments at ISU: C6 and more...
Shut up, be happy. The conveniences you demanded are now mandatory. -- Jello Biafra