You buy books on your device, you read them on your device, and your history, bookmarks and other metadata all get synced to your iTunes account in the cloud. And it works great. But a lot more apps should work like this. Should wireless Safari bookmark syncing cost $99 a year? Shouldn’t it be easy for iOS game developers to sync progress for the same game across multiple devices using the same iTunes account? App Store developers shouldn’t have to rely on another third-party — Dropbox — for this sort of functionality.