The San Francisco Chronicle has a very interesting article describing how people are using Google Earth to discover our world. It is a great introduction to Earth browsing, but also mentions lesser known implementations of this technology. Be sure to check it out.
I find the juxtaposition of these two examples in the article very funny:
"-- Art historians used Google Earth imagery to conclude that Renoir's opalescent painting "The Bay of Naples (Evening)" actually depicts a sunrise. The painting has been re-titled.
-- An excavation business in Fenton, Mo., whose owner once rode around in his pickup scouting for available land to dump fill dirt, now lets his son do the searching on Google Earth."
I suggest a new motto: Google Earth - The tool of choice for art historians and dirt dozers operators alike.