"The purpose of Data.gov is to increase public access to high value, machine readable datasets generated by the Executive Branch of the Federal Government."

Follow up:

Data.gov came out of the Obama administration's "Open Government Initiative." Included are searchable catalogs of data, links to tools for mining data sets, a tutorial, and a form for suggesting additional data sets.

Try it out!! http://www.data.gov/

Also, check out the list of U.S. Government statistical resources from the library's Web site under "Find Government Information."