1040.com: Tax information for everyone.
Nolo: Taxes & Audits, Your home as a tax shelter, etc.
SmartMoney.com: Tax guide, etc.
TaxBrain: A full-service online tax center.
TaxCut.com: From H&R Block
Taxgaga: Tax news, Tax calculators, Business Taxes, Investor Taxes, etc.
Taxhawk.com: Tax deductions, e-file forms, tax tips, what's taxed on your home, rental property, etc.
Taxes In-Depth: The in-depth guide to taxes.
Taxopedia.com: Tax information all of us can understand.
TurboTax.com: Taxes made easy. Taxes done right.
Uncle Fed's Tax Board: The complete online resource for tax relief.