United Nations Office on Drugs and Crime releases a report annually on global trends of drugs.
European Monitoring Centre for Drugs and Drug Addiction
Count the Costs
Count the Costs is a collaborative project between a range of organisations that, while representing a diverse range of expertise and viewpoints, share a desire to reduce the unintended costs of the war on drugs. http://www.countthecosts.org/
Transform: Getting drugs under control
Transform is a charitable think tank campaigning for an end to the drug war. http://www.tdpf.org.uk/