Comtrade. United Nations database that details commodity trading between countries from 1962 - present. Identify countries that are heavy trading partners, or see what countries are the big traders of petroleum, corn or bananas (to name just a few).
European Union: External Trade. Links to key organizations and legislation within the European Union which focus on trade issues.
SourceOECD. SourceOECD provides comparative statistics from the 30 member states (industrialized nations) of the Organization for Economic Cooperation and Development, as well as development statistics from other countries.
World Trade Organization. Manages trade negotiations between countries. Many reports are indexed in Lexis Nexis Statistical and available in microfiche from the Index to International Statistics.