How good is facial recognition this days? It'd be a pain if you couldn't log in because you shaved your beard off one morning... The barcode idea isn't so bad. You could get one tattooed on the back of your wrist or something.
Maybe just use the mic for voice recognition instead. Even more Mac laptops (and iMacs) have mics than iSights, and the technology is probably more reliable.
As for loading at login, there is a startup items folder in your Library (there is on Tiger and Leopard anyway). There is probably other ways too. Just add a line to an appropriate startup script maybe. ARD is running when the login window comes up, and that isn't in startupitems.
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