Wired talks today
, a british internet radio station that uses collaborative filtering to give you your personal stream of music... which is great, I guess, if you're into internet radio. But why is this different from any of the thousands of file-sharing outfits out there, where you can download whole CDs by the gigabyteload, and then set it to random reproduction?
I guess that collaborative filtering works when the good described is scarce, maybe expensive, or you have to invest time and/or money to "get" it: movies, books... but music! If you think you might be interested in something, just download it, check it out, and that's it.
If there's something interesting about the radio, it's the listening experience, people calling in, the speaker blathering out... I don't think this will succeed. It's interesting, and I might even try it... but gets a thumbs down anyways.