Census 2010 Data Mapped in Google Maps
The censusmaps2010.com sites show the US Census 2010 data by census block overlayed inside of Google Maps or Bing Maps. The Census Bureau has released three different databases so far (May 2011): Census by Race, Census by Latino, Census by Housing Units. When viewing the Census by Race data the color of each census block is determined on the percentage of each race. The default colors are red for white, blue for African Americans, yellow for Asian Americans and orange for Native Americans. Heatmaps can be generated by selecting one of more categories, and then selecting the 'Heatmap' icon in the same datasource. As you zoom or pan imagery is updated almost instantly and numbers are regenerated for the view.
Explore the sites yourself at: http://www.censusmaps2010.com