Yahoo Sandbox datasets
Language, Graph, Ratings, Advertising and Marketing, Competition
Datasets for Classroom Use
Very Basic Datasets for Students from John Rasp at Stetson University
Nice collection of very simple data sets for students from Hope College
Statistics and Datasets
Good collection of basic data sets from Julie Bauder at Grinnell College
Comprehensive source of US statistics and more
Public access to “high value, machine readable datasets” generated by the Executive Branch of the Federal Government
Rodney Fort's Sports Business Data
Micro-Data Access from CDC website
US Census Bureau
A page created by US Census Bureau containing official statistics
The world's leading source for public opinion data since 1935. Gallup Polls, public releases and special reports, archives, to-the-editor and more.
U.S. Department of Commerce
A U.S. government agency whose responsibilities include expanding U.S. exports, developing innovative technologies, gathering and disseminating statistical data, measuring economic growth, granting patents, promoting minority entrepreneurship, predicting the weather and monitoring stewardship.
National Archive of Criminal Justice Data
The National Archive of Criminal Justice Data (NACJD) was established in 1978 under the auspices of the Inter-university Consortium for Political and Social Research (ICPSR) and the Bureau of Justice Statistics (BJS), U.S. Department of Justice, NACJD currently holds over 500 data collections relating to criminal justice. This website provides browsing and downloading access to most of this data and documentation.
Interesting Datasets Available Online for Free (from InfoChimps)