Virtual Property:
There's a fascinating post over at Terranova -- a terrific blog on the legal, economic, and social environments in virtual worlds -- on Elizabeth Townsend Gard's experiment with her first year Property students, in which students make "expeditions" into Second Life to explore what the common law property concepts they're learning about in class (the law of finders, adverse possession, landlord-tenant law, etc.) look like in virtual space, and then they report back on what they've learned. The student projects are quite interesting, and the whole project is worth a good look, at least if you're interested in what "property law" might look like in 50 years or so . . . [Thanks to Greg Lastowka for the pointer]
In the larger scheme of things, this thread is more important, though obviously less popular.
It would be very interesting to have a property seminar about virtual worlds taught through something like Second Life -- although I wouldn't at all be surprise to learn that something like that has already been done.
Those interested in further reading are welcome to check out the reading assignment I compiled last semester. It's a pretty solid introduction, I think, and can definitely point you toward relevant legal scholarship.
For something more to-the-minute, I track many virtual property developments on my blog. There's no end to the number of interesting and surprising things that crop up (taxes and gambling are two favorite recent topics).