Peter Gabriel wants to be your DJ

I used it for about 4 months. It uses the music you already have in your itunes library. Their motto is - rediscover your music. So yes, itunes has playlists, but this lets you pick a few songs you like, and it creates a playlist based on the songs you picked (like pandora). The really cool think is it updates the playlist as you listen to it - adding more as you get near the end of it. If you skip a song, it recognizes that as you not liking that sort of song, and it fills with songs better suited to your taste. Here's an example of one of my playlists from it:
I picked - The Raconteurs, Eagles of Death Metal, and the Beatles. It filled it with - Queens of the Stone Age, Korn, NIN, Arctic Monkeys, another Raconteurs, belle and sebastian, fatboy slim, bloc party, radiohead, and bright eyes.

Every playlist it made was pretty good. I only had problems with one giving me odd selections, but the other 15 I have are amazing! FYI - I have nothing to do with this company. Just a huge fan of their work.

The idea is that it composes playlists for you based on a couple of suggested songs, and can update playlists for specific activities (workout, commute, etc.). At least that's what they say.

Wait.... so what makes this worth anything? Doesn't iTunes have PlayList syncing built-in?

this is a really good idea. on the site, it boasts that it learns from the songs that you skip... it it also true while you are listening to your ipod?

SWEET! This is the only thing I miss from my PC days. Well, this and the cool noise my virus blocker would make every few minutes. I heart tuaw!