National Institute on Drug Abuse - the U.S. government agency providing leadership and funding for development of a scientific understanding of addictive disorders.

National Drug Abuse Treatment Clinical Trials Network - NIDA program devoted to bridging the gap between addiction research and treatment.

Clinical Trials Network, Washington Node - Information about CTN activities in the state of Washington.

Blending Clinical Practice and Research - Slide presentations from a NIDA-sponsored conference on enhancing ties between addiction treatment and research.

Alcohol and Drug Abuse Institute, University of Washington - the primary center for addiction research in Washington State. Site has extensive listing of online addiction-related resources. 

Drug Policy Alliance (formerly The Lindesmith Center) - an organization devoted to expanding the scope of public discussion on drug policy.

The National Alliance of Methadone Advocates (NAMA) - principal advocacy organization for methadone patients in the US.

Addiction Treatment Forum - provides current news on opioid addiction treatment.

The International Center for the Advancement of Addiction Treatment - provides information for medical professionals on the the treatment of opioid dependence.