Historypin

Historypin is a like a digital time machine that allows people to view and share their personal history in a totally new way. It uses Google Maps and Street View technology and hopes to become the largest user-generated archive of the world’s historical images and stories.
Historypin asks the public to dig out, upload and pin their own old photos, as well as the stories behind them, onto the  map.

http://www.historypin.com