Online NIOSH Pocket Guide to Chemical Hazards an excellent source for checking chemical synonyms, physical and toxicological properties.

BBC Country Profiles: these profiles provide an instant guide to the history, politics and economic background of countries, territories and international organisations

DIN (Deutsches Institut für Normung e.V.): find the official translation of quoted standards.

Eurodicautom: European terminology database.

MedlinePlus-Drug information: US National Library of Medicine database of prescription and OTC medicines.  

Export 911: probably more than you ever wanted to know about logistics management and cargo insurance.