iTunes has managed to become the de facto standard for desktop music organizers, leaving those with non-Apple devices in the cold. DoubleTwist syncs, shares, and converts your media quite handily, and has a built-in Amazon MP3 store, but can it really replace iTunes?
DoubleTwist (technically capitalized as doubleTwist, as is the fashion at this time) does a lot of neat things that iTunes will never do:

It recognizes and synchronizes with a ton of devices, and otherwise works with any device that your computer recognizes as a storage space.
Converts music and videos …