As I’m working the table for the Mind, Brain, and Education program at Harvard, I’m having a great time chatting with the other vendors in the exhibitor hall. My favorite has been CK-12, a company that offers open-source textbooks to educators. This resource is incredible: teachers can submit textbooks to CK-12, and CK-12 textbooks can be downloaded and customized by any teacher, any where, in any way. This is a hugely powerful tool.
Check these guys out at http://www.ck12.org/flexbook/.