Statistics
Resources 
General Websites
Digest of Education Statistics -- The primary purpose of the Digest of Education Statistics is to provide a compilation of statistical information covering the broad field of American education from prekindergarten through graduate school.
Economagic: economic time series page -- Over 100,000 economic time series data from federal, international, and private sources
Finding Data on the Internet -- Constructed to help journalists find statistics sources
How Much Information? -- Detailed data on volume of information in any format (print, film, Internet, phone, etc.)
PollingReport.com -- Collection of opinion poll data from numerous sources
Social Science Data Collections -- From Yahoo
State and County QuickFacts -- Lists of frequently requested data, from the Census Bureau
Statistical & Social Science Data--From the University of Virginia
Statistical Resources on the Web -- From the University of Michigan
California Statistics
Counting California -- Rich source of statistics, organized by topic and geography, collected by the California Digital Library and the Library of California
International Statistics
CIA World Factbook -- Country information from the CIA
Global Statistics -- County-by-country statistical data, from GeoHive
Infonation -- Statistical data for countries in the United Nations
International Statistical Agencies -- From the U.S. Census Bureau
Population Reference Bureau -- Numerous reports available
World Gazetteer -- Information on cities, town, & places of all countries
U.S. Government Statistics
American FactFinder -- From the Census Bureau
Bureau of Labor Statistics -- Economic statistics from the Dept. of Labor
Census Bureau -- Socio-economic and other data
CensusScope -- Accessible information and graphics, derived from census data
Fedstats -- Statistical compilations from 70 U.S. government agencies
Geographic Profile of Employment and Unemployment, 2002 -- Rich collection of data, often in .pdf format, from the BLS
Historical Statistical Abstracts -- Available for a growing number of years from 1878 to 2003
INS Statistics -- Data from the Immigration & Naturalization Service
National Center for Health Statistics
Stat-USA Internet -- Statistical service of the U.S. Dept. of Commerce
Statistical Abstracts of the United States -- PDF format files
TRAC -- Transactional Records Access Clearinghouse, providing "statistics on federal law enforcement, staffing, and spending."
U.S. Economy at a Glance -- Various current statistics in an easy-to-use format