I've just found out about the trick when searching images through Google. Add &imgtype=face at the end of your image search link and it is going to return only pictures with faces It does work very good, great "face recognition" software. Example http://images.google.com/images?q=Bill+Gates&imgtype=face&ndsp=18&svnum=10&um=1&hl=en&start=36&sa=N
yes, google actually has many cool search type secrets well not secrets but something that has been out for a long time, just the power of google
Google did acquire Neven Vision, an image recognition company. Also see http://googleblog.blogspot.com/2006/08/better-way-to-organize-photos.html