Although it hasn't exactly exploded into the mainstream music-listening population, the music-sharing application Simplify Media has a growing network of fans--in no small part because it's available for Windows, Mac, and soon the iPhone. When you install it, you must choose to sync with either Winamp or iTunes playlists, although you can change your preferred program after installation. After setup and restarting your music player, you'll see a "Simplify Media" selection in your left-hand navigation. Expand it, and you can browse all of the music available from you and your friends.
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