RecognizeMe is the first Facial Recognition security for the iPhone. Although not perfect, RecognizeMe does a pretty good job at facial recognition, given optimal conditions. RecognizeMe sits on the iPhone passcode screen, so it serves as an alternate to, rather than a replacement for the passcode.RecognizeMe uses 2 2 different algorithms to verify, one is good for accessing 3d biometrics, the other is good at weeding out false positives based on feature analysis. This tweak'll be available for $6.99.
Here's a video showing it in action:
