Remember "Am I Hot or Not?" - well, it looks like someone turned that basic concept into an online dating service. You rate people's profiles (which may include photos), and it claims that as you rate more people - and more people rate you - it will play matchmaker, predicict matches that will like each other.
I saw this on the screen of someone's PC while watching Wired for Sex (or maybe Cybercrime - both TechTV shows - but I think the former) and being curious and bored I checked it out. And yeah, I put up a profile because, well, why not?