WebMD
Web Md: Introduction to Parkinson's Disease
This site from WebMD Health contains a thorough introduction to the causes of Parkinson's Disease, its signs and symptoms, and its atypical variants. The information is fairly in-depth and very interesting in its descriptions.
CNN
Cnn: Michael J. Fox Reveals He Has Parkinson's Disease
This article, from CNN.com, discusses actor Michael J. Fox's battle with Parkinson's Disease. It provides information on disease treatments and has links to other sites with information on Parkinson's Disease.