The opengl manual pages list every function that opengl supports, explaining what they do and what parameters they take. Needless to say, its invaluable. It comes in two flavours; html for on-line viewing and postscript for downloading and viewing off-line.
Very useful site. Keeps you up to date with whats going on in the world of OpenGL and has access to loads of resources for the beginner. Check out the tutorials and news sections while you're there.
The EFnet OpenGL FAQ is here maintained by Dan Mintz. Take a look here, if you've got a question about OpenGL chances are its answered here.
A cool site with many tutorials for the beginner. In addition, there are featured OpenGL demos and lots of information for porting opengl programs to different platforms.
Nate Miller's programming page has some excellent examples on it. Take a look.
A website by Roman Podobedov that covers the basics of opengl, as well as some more advanced stuff. Lot's of useful links on there too - worth a look.
Ryan's OpenGL page is useful is you want to use one of the many miniGL drivers that are around. He's also working on a game.
If you want to know how to do hardware multitexturing then have a look at some of the files on this site.
Scott Heiman is a regular on the OpenGL news group and has lots of information regarding Borland C and how to get it working with OpenGL. If it hadn't been for this site then I would have never got going. There's other stuff on there too, as well as a good selection of OpenGL links to keep you busy.
"The Cornflake Zone" has some good details on selection without using the OpenGL selection mechanism, as well as info on his modeler project. Go check it out.
A page maintained by David Nishimoto with links to lots of useful OpenGL source snippets.
My favourite editor at the moment. As soon as I get the file specs. I'll gladly register.
A site containing massive numbers of links to virtually every Lightwave tutorial on the net (well, maybe)
AC3D is a cheap shareware modeler capable of loading and saving many a different format.
Blue Moon Rendering Tools - this is a free raytracer that adheres to PIXAR's RenderMan interface. Could be useful playing around with this if you want to get into 'the business'...
Amit's game programming site has a definite AI slant to it. If that kind of thing is your bag - you'll not be disappointed with this site.
Website and content, Paul Groves