Amazon is offering 200 free full-length MP3’s for download from their web site. As far as I can tell they are free of any DRM stuff, and they played without any problems in iTunes on my Mac. The list of songs is updated every six hours, and you can choose to listen to a 30 second preview of each song, or download the entire thing.

There are quite a few well known artists like Moby and The Strokes and Jimmy Eat World on the list, rather than indie bands that no one has ever heard of. There are rare and unreleased tracks available as well.