StateMaster and NationMaster
Two from Philip Williams (Cordova):
A free educational resource, which contains updated and essential information about the United States gathered from such primary sources as the US Census Bureau, the FBI, and the National Center for Educational Statistics. This site allows a user “to research and compare a multitude of different data on US states.” It uses much visualization technology to provide pie charts, maps, graphs, and scatterplots. Stats are found on everything, as it states on the site, from toothless residents to the percentage of carpool users.
Also a free educational resource, this site is a vast compilation of data that allows graphical comparison of countries and other essential and up-to-date information from such sources as the UN, OECD, and the CIA.
Very comprehensive site and many, many statistics.