A few blogs (like this one) have been posting about this photographer called Peter Funch. According to his portfolio site, Funch has been taking photos for the past 9 years. What has brought him to people's attention recently is a series he's done called 'Babel Tales'. Essentially his technique is to set up on a corner in Manhattan, and take photos of people doing or wearing a particular thing. He then creates a composite image that features all these similar people. So in the photo below for example, everyone is yawning.
As I said, it's a pretty cool technique. It's simple too, so I imagine you'll probably see a bunch of stuff like this in the near future with people trying it out for themselves. Enjoy the rest of these shots, or check Funch's site for more of his work.