Here are just a few links from a range of sites I have found useful.

 

3D Cafe One of the best sites I've found - if you're a 3D MAX user.

Blur Studio Excellent Tools and Plug-In site.

3DLUVR Some good info on the 3D world.

Splutterfish Home of Brazil renderer and a good 3D modellers gallery.

Cuneytozdas Free MAX downloads including Texporter.

Space and Motion Interesting site for Art, Philosophy and Science.

Chess Art A useful site for Chess Players.