"The Music Genome Project, an attempt to define music by it's traits in a way similar to DNA defines traits in humans has led to the development of Pandora. Pandora uses the song choices you make to see what traits appeal to you and present you with custom radio station. While limiting you to thumbs up or thumbs down, the 'gene' heuristics allows for a very quick adaptation to your musical tastes."
I like this project because, as I've said before, all the custom radio stations I've had in the past have been convinced that I totally love Depeche Mode. I don't!