Census Bureau report:
Current Population Survey (CPS):
Income, Poverty and Health Insurance Coverage in the United States:
2006 [PDF]
Income data
Poverty data
Health Insurance data
American Community Survey (ACS):
Income, Earnings and Poverty in the United States: 2006 [PDF]
Data tables
http://www.census.gov/Press-Release/www/releases/archives/news_conferences/010500.html