This MP3 service from Amazon came out quarter 3 of 2007 and I think it has been very successful with the DRM-Free Music. They have improved their selection as well as provided a better way of going though the music and suggested searches.

After all this progress they are now implementing Geo Filtering sales, so songs can only be bought and downloaded through US locations. Meaning you have to be in the US to buy from Mp3 Amazon which is a bad idea in my opinion. This might be from the Music Industry and not from Amazon, but luckily we can still buy and download from iTunes DRM Free music with iTunes Plus.