Uncle Fed's Tax Board http://www.unclefed.com
Providing information on the United States tax system, filing a tax return, and problems that may be encountered by taxpayers. Also offers links to downloadable tax forms.
Tax News Network http://www.taxnews.com/
Tax information and news on subjects including business, e-commerce, insurance and international taxation, from PricewaterhouseCoopers, LLP.
Tax Facts Center http://www.taxfactscenter.org
Tax information for citizens, policy analysts, legislators, and the press. A joint project of the Urban Institute and Brookings Institution.
IRS http://www.irs.gov/
The U.S. government agency responsible for tax collection and tax law enforcement. Includes income tax forms, instructions, and agency publications.