The AAP website is a great resource for information on various aspects of child health including immunizations and safety/injury prevention (including car seats, product recalls), as well as lots of family education information.
The CDC website is an excellent source of information regarding immunizations, especially the "travel" section which gives updated travel alerts and recommended immunizations/medications for visits outside the United States (Example: "Should my teenager receive the Hepatitis A vaccine if we are traveling to Southeast Asia?")
This website was designed by the U.S. Department of Health and Human Services Office on Women's Health to teach girls about their own health, bodies, and growing up issues commonly faced among preteens and teens. The site is dedicated to promoting healthy body images and behaviors among girls, and also includes useful information to their parents and caregivers.
This website offers tools for parents and teens throughout the learning-to-drive process. The website offers information on driving facts, risks, as well as parent-teen driving agreements/contracts which hold teens accountable for safe driving practices.