Game to test kanji trivia
Here's a cool Flash game called "Verbatim" that tests your ability to read obscure kanji compounds and English words (I did best at that).
After the time is up, it creates a mecha-robot for you. The more you got right, the cooler your robo.

Am I the only one getting some silly 3D robot fighting game with no vocabulary test at that link?
@nate
Did you click on the Play box at the lower left?
I got dolphin 海豚 but missed American football, never knew it was referred to as 鎧球, but such an apt compound.