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Sada: Sad Association
This is the largest surviving support organization to help support and advise sufferers of SAD.
Other
Alaska Northern Lights: Seasonal Affective Disorder [Pdf]
A great resource for information about SAD. Read about the symptoms, what causes SAD, how it was discovered that light is the key, and the role that melatonin plays in SAD. Also given are some tips for avoiding the "winter blues".
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Sunnex: The History of Light Therapy
Contains a brief history of the use of light to treat Seasonal Affective Disorder. Includes information about case studies, time periods, and reliability.
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Guide to Seasonal Affective Disorder
This site give information on SAD, effects it has on people, and what causes it.