Go Ask Alice!:
http://www.goaskalice.columbia.edu/
A health question and answer site targeting teens, covering topics such as
relationships, sexuality, nutrition, and emotional health. You can post your
own health concerns directly to "Alice," or read the answers to
questions posted by other teens.
Law For Kids:
http://lawforkids.org/index.htm
Based in Arizona, but lots of good legal info for any teen.
Teen Advice Online:
http://www.teenadvice.org/
Provides support for teen problems through a network of peers.
Teen New Driver's Homepage
http://www.teendriving.com/
Lots of useful tips for teen drivers.