Hmm! Some time back I briefly explored Second Life, seems that others have really been bitten by the bug and are happy to spend time in a virtual world, including academics at Harvard's School of Law, where the Berkman Center for Internet & Society has established a simulated version of their building, some lecture theatres and conference venue.
They have been running an distance education programme using the technology and you can get some information about it here. They have also provided tutorials on using Second Life for their students. The course was also made available to anyone in Second Life who wanted to join in.