Ooh, cool sites!

Here are some more that I like:

zefrank (zefrank rocks! there's so much to do there...)
cow movie (make your own music video featuring a claymation cow!)
homestarrunner.com (it's homestarrunner! games, cartoons, and of course the strong bad email)
orsinal : morning sunshine (lots of cool games. Rottieluver45 posted it her a while ago)