I’m taking pattern recognition.  We had a discussion on biometrics and we came up with the idea of using the gyro info from a smart phone as a password.  This would allow users to shake and move their phone in some pattern that would allow them to log into their system.

I found this paper that details how mallicious apps can monitor when users are typing and gather gyro data to predict the keystrokes and thus possible passwords.  http://www.cse.psu.edu/~szhu/papers/taplogger.pdf.  By using motion based passwords users would not have to fear that their passwords were being stolen.  Maybe since websites can detect if you are browsing with a phone they could ask you to input a motion based password if you have previously associated one with your account.

They are doing something similar using Leap Motion http://www.forbes.com/sites/michaelwolf/2013/02/06/could-that-shake-in-your-hand-replace-your-password-leap-motion-thinks-so/.  This would be great for medical fraud detection.  Can’t use dead people, and you would need the person to be their in order for the system to approve the claim.