We, a group of researchers at PARC, are currently recruiting users for a user study. More information here: http://rachel-epn.parc.xerox.com
Basically, we're trying to study alternative authentication techniques and we need data that reflects people's daily habits.
Just search for "Parc implicit authentication" in the Android market. It's also filed under Applications > Demos.
As an incentive, we'll be raffling off ten $150 amazon.com gift certificates!