Some links, more to come...

http://nehe.gamedev.net - A great OpenGL resource
OpenGL Reference - Its the pyopengl page, but it has the C reference too ;)
http://www.cprogramming.com - C/C++ programming, good forums
http://ai-depot.com/ - AI resource
http://www.wotsit.org/ - Programmers file format collection
http://www.entropysink.com - A place to hang out