Columbia University's Socioeconomic Data and Application Center (SEDAC) has made a Google Maps mashup that estimates population. The Population Estimation Service is graphically driven and the first online tool that can do population estimation. It is fairly easy to use but there is a slight learning curve as one click does not only pan (like normally in Google Maps) but also starts creating the polygon to mark an area for a population estimation. (Hat Tip: Catholicgauzette)
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