Along with Contacts, Calendars and Mail syncing, iCloud also includes three apps that’ll keep all your iOS devices synced through the cloud. They’re called App Store, iBooks and Backup and they’re all pretty self explanatory.
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.