New options for music lovers

In The Bernoulli Effect: A New Front In The Radio Wars, Jeff discusses how the internet has changed the music industry -- how, for instance, more artists are selling their CDs directly through the Web, and how more and better options are opening up for listeners, including a Web-based streaming-audio "music discovery service" that lets you input a name of a pop artist or song that you like, and then follows with similar songs, which you can give the thumbs up or thumbs down, the service learning your tastes as it goes.