This iPhone app called Skakash (http://igg.me/at/skakash/x/2335954) uses face recognition. First app like that I've heard of since Facebook bought face.com last year. This one recognizes celebrities on TV. Thoughts?
I wonder why someone big like Shazam hasn't done this already. Google has been buying up face recognition technology and integrating it into Picasa and Google+ (http://money.cnn.com/2011/12/09/technology/google_find_my_face/index.htm) but is being really careful about doing anything to invade people's privacy. It seems like something like Skakash, which only deals with celebrities, doesn't really face the same problems.