Jun 17, 2007 -- posted by Ramnath R Iyer
Some upcoming technology for you: Google face-search technology is now available for use.
Google’s face search allows you to narrow down your image-search to only those images that contain faces. Having tried it out for a few search terms, I can say that it works pretty well to the extent that the returned images indeed have faces in them. However, it seems to miss a few valid images. On the face of it (pun unintended) it seems as if images containing smaller or many faces seem to go unrecognized.
To actually perform a face-search, do a normal image search at http://images.google.com and then add &imgtype=face to the end of the URI in the address-bar. There seems to be no direct link to use this feature at the moment.
UPDATE: Check out this article on ars technica related to this post.