By George, I think I've got it!

I must admit that I've been slow to conceive of educational applications with Web 2.0 but I just found a really cool blog - http://askatechteacher.wordpress.com/. The Google Earth projects drew me in and I have spent a good 15 minutes down the rabbit hole of this blog. There are links to wikis by grade level. This would be awesome for homeschoolers.