I think a few categories would be useful:
I'd probably rate sites only with a "MUST SEE" rating for exceptional sites.
Hopefully every few posts someone can collate them into 1 list for easy reference.
I'll start with a few I think are really good/great.
The Code Project
Educational *** MUST SEE
I Can Has Cheezburger
Sugar: The Bitter Truth
(He's simply too smart and too funny for anyone to miss.)
Church of the Flying Spaghetti Monster
(If you don't love pirates, you're going to Hell.)
Anyways, that's a short list of a few sites and things that I would recommend to people.
I've obviously missed a lot there, but hopefully some people can help fill in some blanks with more top notch sites.