- Innovative Teachers Network (not sure if you can access it without a password, but google it if need be) - a networking site for teachers to host groups and join groups.
- Community Clips
- World Wide Telescope
Out of these, I think that Live Mesh seems the most interesting. You can have a shared folder across many devices, no matter what platform they are on.
I find it odd that hard drives keep getting bigger on computers when more and more is moving to the web. More and more, you can see how this web based technology will fit seamlessly into the mobile world.
I hope you enjoy. If you use any of these successfully, especially in regards to education, please keep me posted.