Wallet is a neat little utility that — like Keychain.app, which comes bundled with Mac OS X — lets you store all sorts of tidbits like notes, account numbers, PINs, etc. in a safely-encrypted little repository (or, wallet).

Unlike Keychain.app, however, there’s a version for the iPhone that can sync up with the information on your computer(s), if you have a Mobile Me account. Which means that the info in your Wallet database is completely accessible when you’re out and about.