In case you needed one more reason to jailbreak your iPhone, try this on for size: biometric facial recognition. Instead of unlocking your iPhone with a simple password (How boring is that?), you can use the iPhone 4's front-facing camera to scan and recognize your face.
RecognizeMe is a new jailbreak app that helps make your iPhone safe from shady characters and potential homescreen peekers. By matching your face to a pre-defined database, RecognizeMe will unlock your iPhone and give you access to your device.