Historypin

One of my most recent discoveries is Historypin - essentially, people (including you, if you like) can scan old photos and "pin" them to a Google Map, and also add stories to the photos. Explorers of the map can compare the historical photos with what's there now, and the photos can also be viewed in StreetView. It's still in Beta so a bit temperamental at the moment, but potentially a very interesting and useful resource...

Anyone can explore the map - if you want to add photos and/or stories, you'll need to sign in with your Google account.

Click on the screenshot to link to the site, or have a look at this YouTube video to find out more: