A question I’m often asked. But, if this research bears fruit, that will never be a problem again.
From the NY Times’ Digital Domain:
IMAGINE sitting down at your work keyboard, typing in your user name and starting work right away — no password needed.
That’s a vision that the Defense Advanced Research Projects Agency, part of the Defense Department, wants to turn into a reality. It will distribute research funds to develop software that determines, just by the way you type, that you are indeed the person you say you are.
More HERE.
Cubiyanqui 
wow, bizarre. Will it let me in if I just happen to be tired or slightly drunk?