The Anxiety Disorders Association of America site offers information on Generalized Anxiety Disorder, Obsessive Compulsive Disorder, Panic Disorder, Posttraumatic Stress Disorder, Social Anxiety Disorder, and specific phobias. There are also resources available to help people find the help they may need.
The Brain & Behavior Research Foundation’s site answers frequently asked questions about mental illnesses, including anxiety, and discusses research advances in treating and understanding these illnesses.
The National Alliance on Mental Illness Web site houses resources on a host of mental illnesses, including anxiety disorders. The site provides information on treatments, support groups, and recovery from mental illness.
The U.S. government's National Institute of Mental Health has an excellent Anxiety Disorders section, including quick facts, treatment information, and where to get help for both general and specific anxiety disorders, as well as science news and a library of brochures and other helpful resources.