midomi

Heard about this a few weeks back in a SecondCast podcast, but I finally tried it out just tonight. Midomi is a fun website that allows you to sing (or hum) bits of a song, and it searches its database to find matches. It's harder than you think, though -- so far it's only recognized my singing "Happy Birthday to You" and "Friday I'm in Love". You'll get strange looks from your spouse, but it's worth it. Hours of fun!