And there was a report out of WWDC this year of an engineer being asked about moving past username/password log-ins, where the engineer stuttered and stayed silent too long to believe there wasn't SOMETHING happening behind the scenes.  I wouldn't be surprised if Apple didn't do fingerprint unlocks for something -- laptop?  iPhone?  Think of a service like 1Password linked to your fingerprint when you log into the machine.  Could be handy.
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