Augmented Reality Face Recognition
TAT have a rather nice augmented ID demo that is a mash up with face recognition. I believe this is only a concept right now (ie vapourware) but cool nether-the-less.
ReadWriteWeb have rather longer description of the application, take a look here.
Between you an me, me and a few buddies have been looking at building something very similar for a while now. We are currently looking at getting a prototype together. Without doubt this is the future.