Interesting article from the BBC on facial recognition. Interview with a woman who remembers faces after only brief meetings, even years later. She didn't know this ability was highly unusual, she just thought people were being rude to her when they next met up. Also an interview with a woman who now suffers from 'faceblindness' and can't pick out her own kids from a crowd. Test yourself, most people don't even know if they are 'faceblind'.
Test your face blindness here: http://www.faceblind.org/facetests/index.php