Hum a song and this new search engine will recognizes your song and find it.
Midomi, a new company in Silicon Valley (Sunnyvale), has just launched an impressive musical search service.
All you need is a microphone and you can search for music by singing or humming part of a song.
I can see this having useful applications. This may be good to see if that melody you were inspired to write has been done before. Or if you have a melody stuck in your head you can find out what it is.
There are social networking aspects of this online app that could make this popular.