GraphJam: Songs, books, movies, and other pop culture forms explained in the form of graphs.
Some choice examples:
So simple, it is
Comparison to a summer's day
Things we'll need where we're going
Classification of young American females (according to Brian Wilson and, later, David Lee Roth)
I could go on (and, as amybang can attest, earlier today, I did). Suffice it to say this is one of the cleverest things I've seen online in a long time.
Maybe while I'm bored at jury duty tomorrow, I'll come up with more...