Any examples, please? Take a look at Biometrids White paper, theres a whole section that is dedicated to this subject. I wont rewrite it here.
MorganChase, eBay, Yahoo
The list is impressive, as also the numbers are. After all, you are right, the time of the usual passwords, magnetic cards and SMS is winding down. It seems that we are at the turn of a revolutionary leap in this matter. So, its worth to take a closer look at this proposal.