The Tax Policy Blog from the Tax Foundation today has statistical information about varying tax burdens, organized by state, county, congressional district, and major metropolitan area. Additional tax data and research is available at the Tax Foundation website, along with podcasts on tax topics and .pdf copies of assorted Foundation publications.

Federal income tax forms and publication are available at the IRS website, which also includes information about the Free File program for taxpayers with an adjusted gross income of $52,000 or less.

California income tax forms, general tax information, and information about the CalFile (free online filing) program, are available at the website of the Franchise Tax Board.