Please be aware that this is a commercial website. The A.D.D. warehouse has a large collection of ADHD-related books, videos, etc.. The website also has “free articles” and “free research updates” that can be helpful.
CHADD is a membership organization, produces the bi-monthly Attention magazine (for members), and sponsors an annual conference. The National Resource Center on ADHD (NRC) is the CDC-funded national clearinghouse for evidence-based information about ADHD.