I recently stumbled across a new website that is really fun for history buffs, and works fabulously for genealogists! It's called What Was There? and it allows you to take an old photograph - say, of your great, great, great grandparents' house, like this:
Then find the place where it belongs on a Google Streetview map, like this:
...and position the old photo directly over the current image, then use a nifty "fade bar" to fade the image from then to now! When you've got the fade bar about in the middle, the results can even be ghostly! (Can you see the ghosts of the Mann family hanging around their house about 130 years later?) How cool is that?
To see this image on What Was There?, go here: http://whatwasthere.com/b/4645 and try the fade bar for yourself. Then try uploading a family photo of your own to see how cool it is! It's free, it's easy, and it's a fun little bit of history to share with your family and the world.
Be sure to come back and let me know if you try it - I'd love to see what you come up with!