The Internet Encyclopedia of Philosophy is an excellent site with a useful search feature.

Erratic Impact's Philosophy Research Base is categorized by history, subject and author. Integrating text resources with the best online resources, this study guide attempts to aid both academic and general interest in all philosophical genres and their related fields.

On the Encyclopedia of Psychology site you will find links to information on adolescent psychology that deal with such topics as bullying, depression, peer pressure, teen violence, eating disorders, mental health, drug abuse, parenting, sports, and self-injury.