virtual hallucinations
http://www.wired.com/techbiz/media/magazine/15-06/st_insane
http://www.desmoinesregister.com/apps/pbcs.dll/article?AID=/20060322/NEWS01/603220343/1002
http://secondlife.blogs.com/nwn/2004/09/in_the_minds_ey.html
medical
mixed reality