A couple of links you might find useful. If you can think of any more, feel free to ask a mod or manager to add them.
Rayman Links
WikiRayman: A Rayman-Wikipedia written by fans. Contains info on just about everything related to Rayman.
Rayman-Fanpage: A goldmine of Rayman related images and info. The site is in several languages as well.
Wikipedia: The Wikipedia article on Rayman.
Rayman 1 Walkthroughs and cheats.
Rayman 2 walkthroughs.
Rayman 3 walkthrough.
Rabbids Links
Wikipedia article.
List of stuff you can win/unlock in Raving Rabbids.
Rayman Raving Rabbids walkthrough.
Raving Rabbids 2 walkthrough.