Agencies/Organizations --

U.S. Agencies and Government Portals:

Census Bureau

Foreign Trade Statistics
State Export Data
U.S. International Trade Statistics
U.S. Trade in Goods (Imports, Exports and Balance) by Country

Economic Research Service (ERS) - [U. S. Department of Agriculture]

Foreign Agricultural Trade of the United States (FATUS)
Trade and International Markets

export.gov

Market Research
Market Research Library
TradeStats Express

Foreign Agricultural Service (FAS) - [U.S. Department of Agriculture]

Market and Trade Data
U.S. Trade Internet System

International Trade Administration (ITA)

Office of Trade and Industry Information (OTII)

trade.gov

Trade Information Center (TIC)

Country Information

U.S. International Trade Commission (USITC)

Harmonized Tariff Schedule of the United States (USITC)
Dataweb

U.S. Trade Representative

National Trade Estimate Report on Foreign Trade Barriers
Trade Policy Agenda and Annual Report of the President

International Organizations:

International Trade Centre (ITC) UNCTAD/WTO -- United Nations Conference on Trade and Development/World Trade Organization

Countries

World Trade Organization (WTO)

International Trade Statistics

California:

Tradeport (California's Gateway to Global Trade)

Country Profiles from World Trade Press
Trade Statistics

Country Commercial Guides (CCG) - current : Market Research Library -> under "Report Type" select "Country Commercial Guides (CCG)"
Country Commercial Guides (1996 - 2001) (U.S. Dept. of State)

Country Reports on Economic Policy and Trade (Dept. of State)

FAS Worldwide (formerly AgExporter)

Foreign Agricultural Trade of the U.S. : FATUS (USDA / Economic Research Service)

Foreign Trade Highlights (OTII)

Foreign Trade Statistics (Census Bureau)

Guide to Foreign Trade Statistics (Census Bureau)

Harmonized Tariff Schedule of the United States (USITC)

International Trade Update (ITA)

National Trade Estimate Report on Foreign Trade Barriers (USTR)

State Exports to Countries and Regions (OTII)

Trade Policy Agenda and Annual Report of the President (USTR)

U.S. International Trade in Goods and Services (FT900) (Census Bureau)

U.S. International Trade Statistics (Census Bureau)

USITC Tariff Database

U.S. Trade Internet System (FAS / U.S. Dept. of Agriculture)

Year in Trade (USITC)

Glossaries of Trade Terms --

Comprehensive Guide to International Trade Terms (National Trade Data Bank)
Glossary of Trade and Shipping Terms (Tradeport)

Other Trade Guides --

Government Documents on International Trade (Purdue)
International Trade (Univ. at Buffalo)
Trade Information (Univ. of Colorado at Boulder)