Wikibooks

"If Jimmy Wales and his colleagues at the Wikimedia Foundation have anything to say about it, you could have another way to go--the Wikibooks project. It's their attempt to create a comprehensive, kindergarten-to-college curriculum of textbooks that are free and freely distributable, based on an open-source development model. Created in the same mold as the Wikipedia project--the open-source encyclopedia that lets anyone create or edit an article and that now has nearly 747,000 entries in English alone--Wikibooks is still in its earliest stages." (Wikibooks takes on textbook industry | CNET News.com)