http://www.apdaparkinson.org
The American Parkinson Disease Association, Inc. was founded in 1961 to "ease the burden and find a cure" for Parkinson's disease. Headquartered in New York, the organization focuses its energies on research, patient support, education and raising public awareness of the disease.

http://www.parkinsonsapda.org
The American Parkinson Disease Association West Coast Office

http://www.diseasesexplained.com   
Diseases Explained

http://www.amedeo.com
AMEDEO has been created to serve the needs of healthcare professionals, including physicians, nurses, pharmacists, administrators, other members of the health professions, and patients and their friends. They can easily access timely, relevant information within their respective fields. AMEDEO’s core components include weekly emails with bibliographic lists about new scientific publications, personal Web pages for one-time download of available abstracts (see example), and an overview of the medical literature published in relevant journals over the past 12 to 24 months. All these new information resources are free of charge.

http://www.medlineplus.gov/
MedlinePlus will direct you to information to help answer health questions. MedlinePlus brings together authoritative information from NLM, the National Institutes of Health (NIH), and other government agencies and health-related organizations. Preformulated MEDLINE searches are included in MedlinePlus and give easy access to medical journal articles. MedlinePlus also has extensive information about drugs, an illustrated medical encyclopedia, interactive patient tutorials, and latest health news.

http://www.pmdi.org/
The Parkinson's & Movement Disorder Institute is head quartered in Long Beach, California, with patient care offices in Laguna Hills, Long Beach and Fountain Valley, California and an animal research laboratory in Long Beach.  Our main headquarter is in Fountain Valley.

http://www.teamparkinsonla.org/
Formed in 2000, Team Parkinson (TP) is a non-profit organization. Under the guidance of The Parkinson Alliance, the TP staff and volunteers work year round toward the goal of raising funds for research to find a cure for Parkinson's disease. We guarantee that 100% of all individual donations go directly to research.

http://www.trialscentral.org/
TrialsCentral™ provides free and confidential access to listings of clinical trials. This information about current clinical research studies helps to support informed, evidence-based decision making in health care.

http://www.centerwatch.com/
CenterWatch is a Boston-based publishing and information services company and a business of The Thomson Corporation. We provide information services used by patients, pharmaceutical, biotechnology and medical device companies, CROs and research centers involved in clinical research around the world.

http://www.youngparkinsons.org/
At the APDA Young Parkinson's Information and Referral Center ourfully as possible. We understand that whether you are newly diagnosed or if you have mission is to provide you with accurate information and supportive resources to help you lead your life as been living with the disease for years, having Parkinson's disease at a young age creates very particular issues, questions and concerns.

http://www.pdtrials.org/
PDtrials.org is a website that helps people easily find and understand Parkinson's disease clinical trials.

http://www.patientslikeme.com/welcome/community/pd
The PatientsLikeMe Parkinson's Disease Community.