Syndromes & Conditions - Prader-Willi Syndrome
Disability online : Prader-Willi syndrome Department of Human Services, Vic. 
This provides a range of information for people with Prader-Willi syndrome, their families and carers. It outlines symptoms, causes, associated problems and diagnosis, treatment options, specialist care and sources of help. Links to a related article on obesity and hormones.
This website provides information about the syndrome, details on publications and research reports, access to an online newsletter, upcoming conferences, and contact details for members in many different countries.
Prader-Willi syndrome Contact a Family 
Provides a good basic description of the syndrome and the contact details for the UK support group.
The Prader-Willi Syndrome Association (PWSA) of Victoria -- Melbourne: 
Includes information about Prader-Willi syndrome; new diagnosis and an infant guide; teenagers and adults; a member's library; information for professionals; and links to further resources and PWA associations around the world.
Prader-Willi Syndrome Association (UK) PWSA (UK) 
Website of the Prader-Willi Syndrome Association in the UK, this site provides information on a wide range of topcics related to Prader-Willi syndrome. for parents, family members, professionals and people with PWS. It includes links to downloadable resources as well as publications for purchase.
Prader-Willi Syndrome Association (USA) PRADER-WILLI SYNDROME ASSOCIATION (USA) 
A comprehensive website that providing information for parents, family members, teachers, researchers, and professional practitioners.