CenterWatch Clinical Trials Listing Service
A wealth of information related to clinical trials, such as a listing of more than 41,000 industry and government sponsored clinical trials as well as new drug therapies.  Designed to be a resource both for patients interested in participating in clinical trials and for research professionals.

ClinicalTrials.gov
The U.S. National Institutes of Health, through its National Library of Medicine, has developed ClinicalTrials.gov to provide patients, family members and members of the public current information about clinical research studies.

Rehab Trails
Information for patients and caregivers on new clinical trials with news and announcements.  Also contains a search utility, newsletter, FAQs, articles, and resources.