Statistical Abstract of the United States — 2008 online

The US Census Bureau has been compiling and publishing this valuable resource since 1878.

It is an excellent starting place when looking for statistical data. Search the database, or browse through categories of data such as: Energy & Utilities, Geography & Environment, Natural Resources, Science & Technology. References for these data are always cited, and via the Excel spreadsheets are directly linked to the more complete resources on the web.
The PDFs give the URLs for “cutting and pasting”.