Facial recognition photo organizer

The current photo organizing systems like Picasa allow people to tag their pictures to create buckets of pictures. Among the most common things you can tag a picture for is who is in the picture, me, my wife, my sister, Fido, etc. The people in pictures is a fairly limited set and it is a pain to actually manually tag the pictures so nobody does it. But if you want to reminisce about an old girlfriend or high school shenanigans with your friend DJ Dave and their pictures are scattered about in various folders then how do you quickly view by person.

By combining a facial recognition tool with a user interface to allow the computer to learn which people are in the pictures, a photo organizer plugin to a system like Picasa could quickly learn to tag each image as it arrives with the appropriate people based upon facial characteristics. Ultimately this could be expanded to handle other living things like pets. The result would make it easy later to search for all images with Fido in them or just open a virtual folder for your pets.