Lock your phone when snatched. An updated and improved derivative of PluckLock.

This polls the accelerometer in the background and will lock the phone if the
sum of all non-gravitational forces ever exceeds the threshold.

PluckLockEx loads immediately into its preferences page, where you can set
the only preference relevant to the app's operation: the threshold at which the
phone will lock when it receives an acceleration jolt. The application will run
in the background, constantly monitoring