Apple's iCloud services aren't having a great morning, with problems being reported for Photo Stream, Documents in the Cloud, and iCloud Backup. According to Apple's System Status:
Marco Arment, creator of the popular Instapaper app for the iPhone and iPad, noticed an problem related to changes made in iOS 5 tied to iCloud backups.
Apple has put up a post on their Developer News page tellings devs to start getting their apps ready for iCloud Backup and Restore:
iCloud introduces a smarter way for users to back up their info. It's important to read the new iCloud Data Storage Guidelines to ensure that your app works best with iCloud Backup and Restore, available on iOS 5.