Version 1.1 of the definition has been released. Please help updating it, contribute translations, and help us with the design of logos and buttons to identify free cultural works and licenses!
Portal:Educational Materials
Directories and Repositories of Educational Materials
AEShareNet collects over 20,000 learning materials from Australia. It has its own scheme of licenses, and some of the may be "free content" under the Definition.
The One Laptop Per Child initiative should generate repositories of free content for education in several different languages. In the meantime, a starting point is the OLPC Wiki.