There are some pretty cool sites out there to help educators and librarians. When looking at the topics of the Award winners, I chose Education, and looked through several until I landed on ThinkFree. This site is very nice and fairly easy for writing, putting together powerpoints, etc. and sharing what you've written as well as being able to edit and see previous drafts. It's really nice how you can generate the document right from ThinkFree, so you don't have to bounce back and forth between a Word document and download or upload separated documents to share. This has really nice possibilities for all kinds of classwork from English, Literature, Journalism, etc. and students being able to easily work on group projects without having to be together. I'd say it's very similar to Googledocs, I just haven't played with Google enough to know if you can generate powerpoint presentations, etc.
As I was perusing the Award sites, I came across the One Million Masterpiece site and just had to play with it. I didn't get into all the aspects of it, but I did create a simple, goofy picture which I added to the big picture currently being created. This web site has so many implications for Art as well as Social Studies classes. There are users from all over the world and teachers could use the networking capabilities in a variety of ways for cultural and geographical lessons.