ADOL:  Adolescent Directory Online - Teens Only!
http://education.indiana.edu/cas/adol/teen.html
Peer pressure, crime & violence, Internet hangouts, Ask Dr. Math, Sex, etc. & Teen Advice online to name a few!

Sites Recommended by Jamestown Teens!
http://www.ferryhalim.com/orisinal
http://www.vectorpark.com
http://www.wonka.com/home/flash_home.asp