Update 17.02.06: The page has been transwikied to wikibooks. Its new location is here. I can continue to work on it and find a proper place in the wiki universe.
Whenever I see all those wikis all for free for me to use -I use wikipedia almost every day- I feel joy and a little bit of guilt. I will pay my debt by contributing.
Check out these wikibooks:
The World History Project
Learning the German Language
Imagine a world in which every person has free access to the sum of all human knowledge.