Second Life (http://secondlife.com/) is a virtual world. People use it for various purposes, teachers for learning, teaching and professional development.

My avatar, San Krokus, is a teacher, but I can choose to be whoever or whatever I want, or change completely whenever I want. Role-play that works – fun, isn't it?

The community of teachers is active. There are communities of practice where teachers exchange ideas, collaborate on projects, there are language schools, conferences are organized regularly.

You teleport into that 3D space and walk, run, jump or fly.The sense of movement is such that you feel tired after a long sightseeing tour. In fact, it is a kinesthetic students' paradise.

Second Life is good for all learning styles: you use voice and chat simultaneously, you can read and write, create and move objects around you. Augmented reality is the reality of Second Life, you can script objects to give students information when touched.

In Second Life you can create some unforgettable lessons, e.g. teleport your students to real life cities, to galleries, theatres or concerts, simulations, scientific or language projects. During a group work, you can teleport your groups into the sky where they can't hear one another.  Even if you decide to teach on the beach or under water, you can have your favourite the web 2.0 tools at your disposal, in your inventory.

If I got you interested, you can find more information about teaching in virtual worlds:

 http://avalon-project.ning.com/

http://www.virtlantis.com/

http://slexperiments.edublogs.org/