These are the latest ones listed on pdtrials.org:

Official Study Title: Modulation of Motor Planning by Behavioral Stimulation in Persons with Parkinson’s Disease http://www.pdtrials.org/front/trial_...p?trial_id=130

Official Study Title: A Multicenter, Double-Blind, Parallel Group, Placebo Controlled Study of Creatine in Subjects with Treated Parkinson’s Disease (PD) Long term Study (LS-1) http://www.pdtrials.org/front/trial_...p?trial_id=131

Official Study Title: A Randomized, Double-Blind, Active (Pramipexole 0.5 mg Tid) and Placebo Controlled, Efficacy Study of Pramipexole Given 0.5 mg and 0.75 mg Bid Over a 12-Week Treatment Phase in Early Parkinson's Disease Patients (PramiBID) http://www.pdtrials.org/front/trial_...p?trial_id=182

Official Study Title: Qi Gong Exercise for Parkinson Fall Prevention http://www.pdtrials.org/front/trial_...p?trial_id=184