Keeper ($.99, available here) from Callpod is an application that enables users to quickly, easily and safely store all sensitive passwords, notes, lists and other personal information on their iPhone. The software allows users to search, index and protect information through multi-layer, 28-bit military-grade AES encryption. In addition to storing data on the user's device, Keeper backs it up on their PC or Mac. It also allows users to share protected data between multiple iPhones and even has a self-destruct mode that erases all secret data if a password been entered wrong a certain number of times.