Taking mobile phone security to the next level, BioWallet Beta uses iris scanning and signature recognition as the keys to access devices. The Android OS program is in a testing phase at the moment, but should be available soon.
The Biowallet site explains more:
BioWallet is basically a “safe wallet” that can store sensitive information (passwords, certificates, documents, conversations, notes, pictures, etc.). This information can only be accessed to by the user resenting his/her iris or signing in the touch screen. The data is kept secret even if the device is lost or stolen using strong biometric encryption techniques.