Whats that little red book with my picture in it for?
At the check in desk the only proof that you are who you say you are is your passport *.
At security and the gate they also check your passport along with your boarding pass.
So this new biometric system just tells the professional security/police/immigration officials to not look at your passport because 'Traci' at the check-in desk, or a card reader at the automatic check-in has already done it?
(or driving licence if you are traveling in democratic Europe)