I know Eric Hall used SL in his classroom, he often responds to the list off hours, so I am sure he will chime in ...
SL has a VERY dark side, make sure your students don't wander off (when/if using an 18+ account).
Minor accounts of course are cordoned off, and if its still the same way, it takes an FBI background check to become an approved adult that is allowed to interact with -16 student accounts.
I don't thing the 16&17 accounts were available 'back in the day'
update on an old issue of the electrical expense of avatars
for those of you interested in SL in general, there was always PD and networking opportunities in and around ISTE island.
got anywhere with SL in the classroom? Or if David Wells and Tom Mays are on list and still doing things for PD?