The Oakland University website shares some valuable information about creating learning communities in the virtual world second life. Here's a blurb:

"Second Life is a virtual three-dimensional world where people meet by means of an avatar. Educators and their students have an increasing presence in Second Life, holding virtual classes and participating in interactive events, such as simulations, role-playing, and 3-D webquests."

For videos and links to Second Life educational projects, and directions on how to use Second Life, check out: Introduction to Second Life.