I am completely blown away by this thing!
http://songtapper.com/s/tappingmain.bin
Go to the site. Think of a song. Tap your spacebar to the rhythm of the lyrics of that song. And this thing tells you what song you're thinking of (it lists 10 possibilities).
I've done 4 songs so far:
Happy Birthday - gave it as the first option
Birthday by the Beatles - gave it as the second option (behind born to be wild)
Insanity by Boingo - First option
and the only one that it missed,
Boonga by Fred Schneider (if it got that, I'd have already bought 1000 shares of stock in this company if it were possible). But the nifty thing is, if you get it wrong, you just tell it what song it was, and it adds it to the database.
Oh my, this could get veeeery addicting.