In our video demonstrations, we are cutting a sheet of plywood or particle board and place a hot dog in the path of the blade to simulate a user's finger. The SawStop system detects contact between the hot dog and the blade of the saw and stops the blade in approximately 5 milliseconds or less, resulting in only a small nick in the skin of the hot dog.
(I don't usually blog stuff I see on Boing Boing, but this is too cool. Table saws always scared the crap out of me.)
(Also just noticed Boing Boing finally switched to MT. Hallelulijah! Hey Cory! Who's yas got for the redesign? Hmmm...)