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Center for Substance Abuse Prevention (CSAP)
http://www.samhsa.gov/
Center for the Study and Prevention of Violence (CSPV)
http://www.colorado.edu/cspv/
Community Anti-drug Coalitions of American (CADCA)
http://www.cadca.org/
Join Together Online
http://www.jointogether.org/
National Institute on Drug Abuse (NIDA)
http://www.nida.nih.gov/NIDAHome1.html
National Mentoring Center
http://www.nwrel.org/mentoring/index.html
National Mentoring Partnership
http://www.mentoring.org
Office of National Drug Control Policy
https://www.whitehouse.gov/ondcp
An excellent list of links to various sites related to drug and alcohol use.