Here's the choice promised by DVD Jon last week: Amazon MP3. Doubletwist is now powered by Amazon's 5 million strong music store in support of its vision to connect consumers with all their media across any device. The interface is bare-bones simple to navigate (no apps, TV shows, or Movies to clutter the experience) as you preview and purchase music with your Amazon credentials -- tracks are downloaded into your doubleTwist library where they can be synced with BlackBerry or Android handsets, the Palm Pre, PSP or hundreds of other devices. Amazon access is only available to US users from the Mac-only software at the moment. A PC version is "coming soon" along with more country support. See it in action after the break.