General Social Survey:
http://www.norc.org/GSS+Website/ or http://www.gss.norc.org/
Census Bureau:
http://www.census.gov/
FedStats (statistical analysis of over 90 federal government agencies):
http://www.fedstats.gov/
Institute for Innovation in Social Policy (index of social health- socio-economic and health stats):
http://iisp.vassar.edu/index.html
U.S. Department of Justice Statistics:
http://www.ojp.usdoj.gov/bjs/
Uniform Crime Reports (1995+):
http://www.fbi.gov/ucr/ucr.htm