Here is a new approach of how to unlock your device, face recognition. This piece of software is called Visidon AppLock and what it does it protects all your phone content with face recognition.
“Visidon AppLock lets you choose the apps to be protected. Your face is a key to open them! Application uses the frontal camera of your mobile and verifies in real-time that the face matches the one allowed to access the private apps.”
The only requirement for this lockscreen to work is Android 2.3 or higher and its a free app on the Android market.