Penny Arcade: Gaming comics and good forums.
Slashdot Games: Geeky game news
Games Are Fun: A small but awesome games news site
System 16: Yeah, I actully read about hardware for fun
Polykarbon: Cartooning and digital art tutorials
Cowbell Tiara: Excellent artwork. Great techniques with coloring
Hyung-Tae Kim: An excellent artist, did the character designs for Magna Carta on PS2.
Paul Debevec: A graphics researcher at the forefront of lighting
Neon Helium: A site with loads of great OpenGL tutorials
Pouet: A french demoscene site
GLSL Tutorial on Lighthouse 3D: Explains a lot about how OpenGL works with GLSL