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Lost mode allows users to display a message on your iPhone or iPad screen with a phone number or email address to help the person who found the device return it to its rightful owner... (yeah, because that'll work.)
Passbook keeps your boarding passes, store cards and e-ticket details all in one place. Because it has to be integrated into applications, there's not actually that much to see yet.
The Notification Center has been improved. It now includes better notification management and additional details for calendars. It also includes two buttons to allow users to update their Twitter status and Facebook status without having to enter the applications.