The National Prevention Information Network
800-458-5231 (Monday –Friday, 9 am to 6 pm ET)
A clearinghouse of published information, curricula, journal articles, audio/visual aids, and posters for professionals.  Call to let them know what you need and they will guide you through the site or conduct the search for you.

American Sexual Health Association
A nonprofit for professionals and clients that is dedicated to the eradication of sexually transmitted diseases.  It offers clear, concise information on a whole range of issues.  There’s a special section for young people.

The Body
Great information on a whole spectrum of issues related to HIV: medical, prevention, treatment, legal and social.  Type in a question and receive a reply from a panel of experts.  All previous questions and answers are archived so you may not even have to ask.

800-CDC-INFO (800-232-4636)
This is a good, general resource to point you in the right direction.