Thanks to Lawrie for pointing out this video to me, to add into my first ever keynote talk (and for doing an excellent job of calming me down beforehand).
I think this is a great way of highlighting some of the potential navigation and usability problems for students in virtual worlds, which often get overlooked. It also got a laugh.
Also on Second Life, this report has recently been published by EduServ and provides an overview of how SL is being used in Higher and Further education in the UK.