How's this for a double-whammy: Apple and now Amazon are both said to be working on "digital locker" services, which would store users' downloads music and movies in the cloud. This would backup their purchases in case of loss, but also allow them to re-download to other devices.
As Amazon sells all sorts of digital stuff now - music; movies; TV shows; books and apps - their digital locker service would be insanely popular. And that's if it were paid-for - imagine if it were free?
CNET's sources are claiming the service could be announced as early as next week, and could also let customers store other, non-Amazon-purchased items in their lockers too. [CNET]