Amazon MP3: DRM-free music. That means it works on any mp3 player. I approve!
Prices are competitive with iTunes.
Launched today. Lots of good music (my opinion, YMMV).
This is the first time I've actually bought an mp3 - I grabbed an MC Lars single, Hipster Girl.
I've never really been willing to buy an mp3 before because of the hassles dealing with the DRM if I wanted to back it up or anything (I go through more computers and MP3 players than I'm comfortable with), but since it was DRM-free grabbing some MC Lars tracks was obvious.
The experience was really good - the Amazon MP3 downloader was optional, but I wanted to give it a try anyway, and it was a really smooth downlolad, install, and launch.
Think I'll go back and grab some more tracks later on today, after I'm finished working. Amazon Mp3's prices are that sweet-spot where its just cheap enough to be a convenient way of grabbing mp3s. The DRM-free bit is what sealed the deal, because there's no way I'm dealing with that kind of hassle for more than 5 minutes.