National Crisis Hotlines
National Suicide Prevention Lifeline
Childhelp National Child Abuse Hotline
RAINN - National Sexual Assault Hotline
National Domestic Violence Hotline
Veteran's Crisis Line
Al-Anon Family Groups - includes Alateen and search for local meetings
Alcoholics Anonymous (AA) - find local meetings
Mental Health America has a nice list of support groups for everything from alcoholism to overeating to depression / anxiety
Addiction Center provides information about addiction, reviews of treatment centers and connects people with addiction counselors.
Detox to Rehab
DrugRehab discusses co-occurring mental health issues and addiction.
The Recovery Village
Psychologists / Counselors