National Association of Enrolled Agents (NAEA) http://www.naea.org/
National Association of Tax Professionals (NATP) http://www.natptax.com/
American Institute of Certified Public Accountants (AICPA) http://www.aicpa.org/
Internal Revenue Service (IRS) http://www.irs.gov/
IRS Tax Information (FedWorld.gov) http://www.fedworld.gov/taxsear.html
State Tax Sites: