Many good tutorials, for many different operating systems. A good place to check if you're havingproblems. The WackyWorld ofAdvanced Graphics Technology Currently taking an in depth look at the features Carmack haslisted for the Quake3 engine. Fractals, parametric surfaces, implicit surfaces. GL Message boards, news groups description GameDev.
Net forums Starting to get some more traffic.
I try to check these everyday. Linux is cool. A brand new site dedicated to helping Web surfers find the tutorials they are looking for. Blue's News Daily updated news about the 3d gaming scene. Some information I looked through before writing my terrain program.