www.pandora.com

Just found the most remarkable thing...a personalised radio station. Key in single tracks that you love, or artists, and it selects more music for you from the music genome based on the underlying features it selects out of the music you already like. You get to train it up, telling it what you think of each new selection. And it gets closer and closer to what you love. It's a world of wild music closer to my heart's desire.

Wonderful.