The resources are sorted by categories such as "presentation", "music",
"collaborative", and "research". There are 18 categories, plus a "Teacher's
Resources" page with lesson plans, books, games, and more
Create talking avatars for free, which you can embed and use to improve your message, improve comprehension and motivate recipients, as well as a test-to-speech tool.
Voki is a lot of fun. (You can embed finished Voki projects in Wikispaces, too, which could be very handy, especially if you're trying to create a simple site that would be engaging for kids.)