Fresh from the Department of Neat Ideas comes something called Historypin, best described as Google street view with vintage photos thrown in. The Flowing Data blog explains that it is the brainchild of the organization We Are What We Do, built in conjunction with Google and intended as an Internet experience through which older and younger generations can connect.
The idea is you can look up an address and see both the current street view plus a vintage street view of the same area, assuming somebody has uploaded one. The site seems to be in the beta stage, and there aren’t terribly many photos yet. But the potential fun and potential educational value are obvious, especially as more people upload photos. (Thanks to Actuarial Opinions for forwarding the item!)