How to integrate it into the classroom: This is GREAT for your history or geography classes. I'm a huge visual learner and so are many students. Occasionally I have teachers ask me for an electronic copy of a map or a web page with an "interactive" map that students can label. My answer is always, "Download Google Earth" or "Have you tried Google Maps?" Now I can add a little more to those requests. How powerful would it be if you had students locate a city that your class may be discussing in your history class and then have another student post a pic their Grandparents took when they visited that city. Then you could layer the old photo with Street View!
A big "Thank You!" To Li-Bear-y Corner for sharing this great find!