Here's a in-depth review of the Amazon Could Drive service:

http://www.androidcentral.com/review...nd-cloud-drive
VIDEO: http://www.youtube.com/watch?v=36TzWE5MWFM
Bonus: It's running on a tab!!!

The service looks pretty good, and very user friendly.

You know what I *love* about Amazon MP3's? They are DRM free. That's right, you don't need Amazon to play your tracks, which is the reason I would buy Amazon over other services. This is a very compelling feature. Of course, their DRM apps are somewhat disconcerting.