The facial recognition should be in the background and should be a fail-safe. People can copy your password and people can copy you face, but to do both might be harder. ANd harder still to fake a half dozen other markers.

That is the only 'point' of this tech really. An entire suite of passive identifiations checks should be occurring on your desktop computer all the time. Face, voice, and smell, temperature should all be evaluated to make sure you are who you say you are, but also to check up on you. Sure, a netbook with very little processing power to spare wasting time on all of that would make less sense; but your frigging Dual Core….what is your computer doing anyway except twiddling its thumbs?

Darnit! I still won't be safe from my evil twin!