Here are some usefull links on international trade facilitation topics or bodies.

UN - United Nations

www.un.org/en/law/

UNECE - Uniterd Nations Economic Commission for Europe - UN/CEFACT

www.unece.org/cefact.html

WTO - World Trade Organization

www.wto.org

WCO - World Customs Organization

www.wcoomd.org

European Union Gateway

http://europa.eu/

EU - Taxation and customs union

http://ec.europa.eu/taxation_customs/index_en.htm

EU - Trade Contact Group

http://ec.europa.eu/taxation_customs/customs/policy_issues/customs_trade_consultations/index_en.htm

EU - Trade

http://ec.europa.eu/trade/

CASSANDRA PROJECT

http://www.cassandra-project.eu/

WORLD CUSTOMS JOURNAL

http://www.worldcustomsjournal.org/index.php?resource=2

AAEI - The American Association of Exporters & Importers

http://www.aaei.org/

INCU - International Network of Customs Universities

http://www.incu.org/