Santa Cruz has come out with a small run of Simpsons themed skateboards! You can get a reproduction of Bart Simpson's skateboard from the cartoon, a deck that's like a large Homer's head (kinda weird), a Duff Beer deck that's shaped like a beer can, a Duff Beer logo longboard, or a regualr skatedeck with a bloody "The Simpsons" logo. Check 'em all out on the Simpsons Skateboards mini site (to see another board, click on the stuff that's peeking out of the side of the huge background logo).
Now, just to be clear, I'm sure these are OK to skate on, but they aren't going to be the best skateboards on the market. That's not the point - the point is to have something cool and iconic like Bart's skateboard (with all the bright colors!), or a Duff Beer board up on your wall. But, if you want, you CAN skate them!