Centers for Disease Control and Prevention, a resource for information about public health and safety concerns and related topics: http://www.cdc.gov/

Go Ask Alice, a question and answer forum for college students addressing a variety of topics on mental health, physical health, and much more: http://www.goaskalice.com 

National Institutes of Health, the nation's medical research agency, offers resources on a variety of health topics and current health-related research: http://www.nih.gov/

ULifeline, an online screening for suicide: http://ulifeline.com