This is an interesting site worth a creep or two. Justin shared it with me a few days ago and I have finally gotten around to looking at it myself. Instead of trying to explain the concept myself here it is straight from the horses mouth:
"I love old photos. I admit being a nosey photographer. As soon as I step into someone else’s house, I start sniffing for them. Most of us are fascinated by their retro look but to me, it’s imagining how people would feel and look like if they were to reenact them today... A few months ago, I decided to actually do this. So, with my camera, I started inviting people to go back to their future. "