Here is an example of a Magnatune album on Amazon.
I was happy that they got the label right (it says Magnatune) though it's a bit funny that they used the "artwork copyright" field, and not the "music copyright" field from our metadata, so the pages say:
Copyright: The artwork is licensed under the v1.0 by-nc-sa Creative Commons license. http://creativecommons.org/licenses/by-nc-sa/1.0/
I'm also pleased to see that they are offering set-by-the-label pricing, as I asked for our albums to be $8, so as to match what people typically pay on Magnatune.
And so now Amazon is a way for people to buy Magnatune single mp3s, if they don't want to buy the album, and still stay DRM free. The audio quality, at 256k mp3s, is quite good.
If you want the WAV files, you'll still need to visit Magnatune.com, until one of these vendors starts offering perfect quality downloads. FYI, iTunes hasn't made the "no DRM" option available to small labels yet, though I expect with this pressure from Amazon, that may happen quicker now.