Here’s a short video on the new feature of the Second Life® Beta viewer of placing a URL on the surface of a prim. You can interact with the loaded sites, including writing on a Google doc, using it as a whiteboard. You could load your LMS site and all your students could move through it independently. Lots of possibilities.
Try this link to the larger version: http://www.youtube.com/watch?v=RBZ5GUAQpmA
Here are a few stills of the URL on a prim feature: