American Panorama

An outstanding series of historical data visualizations and maps over here:

American Panorama is an historical atlas of the United States for the twenty-first century. It combines cutting-edge research with innovative interactive mapping techniques, designed to appeal to anyone with an interest in American history or a love of maps.

map

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Google Transit

Google stole my mashup idea!

This is pretty awesome. Type a from and to location, and Google gives you public transit routes for your search. It even shows you how much money you’ll save over driving.