http://www.opengl.org &
http://www.opengl.org/developers/code/tutorials.html - definitely the best starting point.

http://nehe.gamedev.net/ - very useful, starts at the very beginning, source ported to many formats, including cygwin and even python in some cases.

more will be added as i find them.

BEAT

Woohoo, Nehe is really good. PyopenGL rocks as well:) (Not too useful for the blender game engine though.)

Not a coder, but thanks for the links:) I can't think of any better ones.