If you have been perusing my 3D Web page, you know that Opensimulator is a piece of technology that I have been investing time in and keeping my eye on.  I have links to some rudimentary instructions for getting online/in-world, but there is also a good introduction on the Hypergrid Business blog.

Hypergrid Business is a primary source for seeing what business and education are doing in OpenSim.

Check out this article: What is OpenSim?