I am helper at Second Life English. Of course I am learning, Nergiz and Daf have been there to teach me how to move with my avatar and do things there.
Here is an invitation to a Free conference at Second Life, please feel free to join.
I have a long way to go but I think is a wonderful tool to teach languages.
The problem is that it requires powerful computers to enter and not all cyber cafes have them.
Gonzalo has been helping me a lot with the hardware so I can visit, he got me a graphic card that allows me to be at Second Life though my PC still crashes sometimes.
Here is a video about how to send and create a notecard in SL
