The Teen Center.
Covers topics from school cliques, to family relationships, to handling stress and feelings of loneliness and depression, sexuality, alcohol and other drugs, and a whole lot more.
www.wholefamily.com/aboutteensnow/index.html

Coping in Unsettling Times: Tips for Students. 
http://www.nasponline.org/resources/crisis_safety/unsettling_students.aspx

Face the Issue - You are not alone.
This site has information and resources on many topics including depression, bulimia, anorexia, alcoholism, drug abuse, self esteem, and others.
www.facetheissue.com

Anxiety
About Anxiety Disorders.
http://www.adaa.org/understanding-anxiety

Anxiety Disorders in Adolescents: A Self-Test.
www.adaa.org/GettingHelp/FocusOn/Children&Adolescents.asp

Divorce
It's Not Your Fault.
A web site for parents, teens and children to help cope with the pain of divorce.
www.itsnotyourfault.org/

Depression
Teenagers Guide to Depression.
Encouraging words from the National Association of School Psychologists.
www.naspcenter.org/kids/teenshome.html

What To Do When a Friend is Depressed: A Guide for Students.
Expert advice from the National Institute of Mental Health.
www.nimh.nih.gov/publicat/friend.cfm

Resources
Nineline 1-800-999-9999.
A 24-hour nationwide toll free hotline that provides immediate crisis
intervention to young people and refers callers to help in their own communities. 
http://www.covenanthouse.org/youth-homeless-programs/crisis-hotline