National Institute of Mental Health
Facts about the symptoms, diagnosis and treatment of Attention Deficit/Hyperactivity Disorder from the National Institute of Mental Health.
National Resource Center on ADHD
Children and Adults with Attention-Deficit/Hyperactivity Disorder site offers support and resources for children and adults.
CHADD - Children and Adults with Attention-Deficit/Hyperactivity Disorder
This site provides tools and resources designed to help improve the lives of people affected by ADHD.