http://www.cgart.com/ looks a bit like digg.com. Well it looks like it's based around the same idea as digg, just for CG art and stuff. The list of categories is based around the whole spectrum:
Animation, Contests, Design, Downloads, Gallery, Hardware, Illustration, Interviews, Jobs, Reviews, Software, Tutorials, Web

It's not that crowded at the moment so there is not much content. Could be interesting once it's a bit bigger.

Edit: there are even two news items about conceptart/massiveblack:
http://www.cgart.com/story/49/
http://www.cgart.com/story/69/