Goombah plug

Cheap plug: if you're a music-loving mac user, you might want to check out our product, Goombah, if you haven't already done so. It creates communities of people with extremely similar tastes for purposes of recommendations and community. It's unique in that it runs on the client side in order to involve the user's CPU in the recommendation tasks instead of dividing up a few server CPU's among tens or hundreds of thousands, or some number of millions, of people. This gives it far more horsepower, and as we get more and more users involved, far more expected accuracy and reliability.

It reads your iTunes profile to learn all about your musical interests and uses that data in extremely detailed ways to find your very best "nearest neighbors" in taste.