Datamasher. Mashups of government data about states. Helps citizens see how states compare on important issues. Users can combine different data sets in interesting ways and create custom rankings by state.
Gapminder. Non-profit venture promoting sustainable global development and achievement of the United Nations Millennium Development Goals. Access and cross-tabulate 200 statistical time series. See espcially Gapminder World and this video from co-founder Hans Rosling's 200 Countries, 200 Years, 4 Minutes
GeoData@UC Berkeley. UC Berkeley Libraries' geoportal where users can search, preview, display, map, and download geospatial data in a variety of formats.The Earth Sciences & Map Library collects GIS data for areas around the world, with an emphasis on the nine county San Francisco Bay Area and northern California, and makes it available for use on the GIS workstations. Library users can download freely available data to use in their projects. The library also collects licensed GIS data that is accessible by library users who are affiliated with UC Berkeley.
Policy Map. Houses thousands of indicators related to demographics, real estate markets, crime, vacancy, income, education, unemployment, health, mass transit and public investments. Allows users to create customized, data-rich maps on the fly, overlay boundaries like congressional districts, zip codes or census tracts. create unique ranges for an indicator. and overlay data you've uploaded to the site.
SimplyMap. Web-based data analysis and mapping application that allows users to create custom thematic maps, tables and reports using demographic, business, and marketing data for the United States. Includes over 70,000 data variables related to demographics, employment, real estate & housing, crime, businesses, consumer spending, and data from the current and historical US Census.
Social Explorer. Provides access to current and historical United States census data, including all historic decennial censuses and American Community Surveys, as well as other demographic information, such as religious organizations. Census data is current to 2010 and historical back to 1790. In addition to being a data resource, the web interface lets users create maps and reports to better illustrate, analyze and understand demography and social change.