ConceptArt.org : amazing art from hundreds of artists, plus great contests, and awesome resources in the forums... if you're an artist and you don't visit this site you are just being cruel to your creativity!
Ctrl+Paint : outstanding resources for artists, primarily digital, but traditional as well
Blue Line Pro Printing : extremely useful services for printing anything you could want, custom one-at-a-time or in bulk
Robot Unicorn Attack! : easily one of the best time-wasters out there. Unicorns, fairies, dolphins, rainbows, stars, explosions, robots! What more could a kittybot ask for?
Give Up Robot : another flash game... bet you can't guess why I like this one