Demo 2006: riya
Now I think this is one of the kewlest companies I saw today.
It uses facial recognition to automatically tag photos that you have. Once you train riya, it goes through all your photos to auto-tag all other photos that have the same face that you used for training.
It also recognize text inside the photo as well.
Definitely wins my 2nd kewl demo award (after LogLogic of course).