Humming is so much fun when you're alone. It's never fun when somebody has to listen to you hum--unless, of course, you're playing Name that Tune.
Lifehacker.com led me to the Nayio humming search. You hum a couple of lines of a song, and it searches for the title and artist. I'm not really sure how this works, but I spent half an hour on it the other day playing my own little version of "name that tune" with Nayio. I wanted to know how good it was.
It correctly identified the national anthem, a few Eagles songs, and some Green day. I also got a few obscure results, but that might have been because the program isn't quite perfect. I know the problem couldn't have been sub-par humming.