Spotted on Searchblog and elsewhere, news that Google demonstrated a tool at Web 2.0 today that uses pattern recognition to determine sex in photos. You're right John, it sure sounds cool. I can't wait to see it (no pun intended) in action. Plenty of other companies and organizations are also doing work in related areas like finding visually similar imagery.
I've posted about just a few of them including Cydral and LTU Technologies in the past. More about LTU here including presentations from the Search Engine Meeting. Finally, Freenet.de from Germany (interface translated here via Yahoo) allows you to limit your search for imagery that must include the face of a human. Another option allows you to limit to terms that actually appear in the image itself. To give it a go, open another tab, and run the your search using the German language interface (and some German words).