Remember when music was cool? Back in the days of Napster, it was music that defined file-sharing; millions of people raced to listen to the most obscure artists found in the libraries of friends and strangers. But that was back when music came on CD, was sold only by the album, and was a chore to rip to computers and (gasp!) transfer to the new MP3 players. Now, with iTunes ascendant, DRM vanquis