ARDA.com
http://www.thearda.com/
Interactive mapping application that allows visitors to map hundreds of religious, cultural and political variables at the national, state and county levels. Also allows users to test correlations between variables.
Center for International Environmental Studies: Ciesin.org-DDViewer
http://www.ciesin.org/tools_apps.html
Interactive mapping application that allows users to map more than 200 variable by state, county and census tract. Users can also calculate statistics and create new variables.
Nationmaster.com
http://www.nationmaster.com/
Interactive mapping application that allows the user to maps hundreds of variables for the countries of the world AND allows users to test correlations between two variables. Makes scatterplot x-y diagrams of the variables.
The Social Explorer
http://www.socialexplorer.com/pub/home/home.aspx
Interactive application that allows students to map a wide variety of demographic, education and ethncity variables, allowing students to learn about their immediate neighborhood or other places across the US.