Well this one is a real challenge for me. I have played around with SecondLife for a couple of hours now. I even left it for a while, thought about it and then returned again. I am totally intimidated by this. It took me forever to figure out my avatar's clothing. I thought I had an outfit I wanted and then the system crashed-- several times--- I even had problems with login and received a message to wait. I finally did manage to get back on and transported my half dressed avatar to a nice peaceful garden, but everything costs $. Then I found myself listening to some inappropriate conversations, so I decided to fly away to be lost another time! Needless to say---frustration set in again.
I know my students would absolutely love this and according to other posts and some blogs I have read, it can be educational. Maybe I would feel more comfortable with the TeenSecond Life. I'm not sure I could use this with my students until I got the hang of it myself, so I will continue to play with it and withhold judgement at this time.