Mainly dedicated to Another World, this site provides a wealth of information about the game's genesis, it's making, both programming, illustration, and the different versions that were released.
You can also download some of Chahi's older games and get an insight on all his creations.
This site is available in French, of course, but also English, Italian, German and Spanish : http://www.anotherworld.fr/index.htm

as a game developer in training, I look up to no other as much as Eric Chahi. I think this guy is a freaking genius

glad to see we share beleifs :)