Note that these are other-than-comic sites. The comics I read are under Links in "Drown the Maidens".

bobdylan.com: I won't suggest many sites for things I am a fan of because 1/ I don't visit them often and 2/ you are probably fans of different things than me. But I'll make an exception for Bob Dylan's site. For an official site it's pretty good, especially the collection of lyrics. They differ from what you hear on the recordings but are very useful anyway.
The Spark: Once upon a time I was addicted to online tests and theirs are the best. I especially recommend Personality Test [b/c it works] and Dateable Test [b/c it's fun]. As a side note, however, I should mention that I preferred their site when they were not so high-school-oriented and used words like 'bitch' instead of 'wench.' And as for Sparknotes, their main division, my whole literature class will praise them forever because their analyses are not only reliable but also free.
Guess the Dictator: Now this is a jewel, a time-stealing jewel. Think of a TV character [or a dictator but I never tried it this way] and the computer will guess who this is. And it often does, too.
Gurl: Shame on me for liking it and double shame for admitting it but check out two things: their paperdoll psychology and their Make Your Own Road Trip [or a few of others, too] game. Silly, yes, but fun.
IMDB: Well, you know it for sure but maybe you forgot or something? Every movie, every person from the film industry: quite impressive. Even if you're not a tenth muse fanatic you'll find it useful.
Home of the Underdogs: A huge collection of games, many of them free. Many are disappointing but some are very good. Pytho's Mask, Sherlock Holmes: The Case of Serrated Scalpel, things like that.
Fun Trivia: I used their tests when I studied for the American history exam and I got sucked in for some time, enough to write a few tests myself.
Svenska Dagbladet: The only online newspaper I read regularly [if not very often].