This is another amazing visualization using the Walmart data, it started with flowingdata doing a cool visualization, its then morphed into various others, the most recent and also pretty spectacular from MichaelVandaniker and shows the intensity of the spread in the same way as a wildfire spreads.
Amazing work…
Some quick examples of what is possible using Google Earth and freely available data, both have been done with freely available data from the
Census website.
Zip Level Mashup New York
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Various levels of geography can be incorporated, ZipCode, Census Tracts, Street Addresses, Counties, DMA, MSA and States.
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 Detailed HeatMapping for the Chicago DMA, at Zip Level
 
