doubleTwist, the iTunes-replacement created by DVD Jon for music syncing to a multitude of devices, including the iPhone, has just built in integration for the Amazon MP3 Store.
This was the big announcement heralded by the 1984 commercial spoof, according to TechCrunch, and 5 million songs are currently available... to some.
Unlike iTunes, doubleTwist with Amazon MP3 support is Mac and US-only right now (not that Amazon MP3 is widely available anyway -- what gives Amazon? You've been promising more for a long, long time now?!) with a PC version coming soon. US users, especially those who have many different devices, with non-Apple devices in the mix, may want to take a serious look at (we know Palm should!) And let's face it -- iTunes needs the competition!
If you're a doubleTwist user, let us know what you think of this new version.