International Trade Administration
http://www.ita.doc.gov/
U.S. Department of Commerce. Includes links to trade statistics and key policy initiatives.

USITC: United States International Trade Commission
http://www.usitc.gov/

Globus & NTDB: National Trade Data Bank

Foreign Trade Statistics
http://www.census.gov/foreign-trade/www/
U.S. Census Bureau.

Web Resources for International Trade
http://www.fita.org/webindex/index.html
Federation of International Trade Associations

WTO/GATT Research
http://www.llrx.com/features/wto2.htm