Clinicaltrials.gov
Resource Information, Provided by the U.S. National Institutes of Health through its National Library of Medicine:

Centerwatch
You can use this site to find 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 recently approved by the FDA.

ClinicalTrials.com
Patient Information - CLINICALTRIALS.COM™ is your source for comprehensive information for current clinical trials being conducted nationwide. Be sure to register for future study information with our Be Informed Registry. Community Resources - CLINICALTRIALS.COM™ has organized contact information for more than 30,000 health agencies and support groups across more than 3,000 cities nationwide. You may search for local Community Health Resources by illness/condition or geographic location. Community Organizations can also become part of our portfolio via the Agency Registry.

acurian.com
Comprehensive listing of clinical trials actively enrolling participants 
Detailed drug information, from development through approval to release 
Exclusive news and commentaries from leading medical and research resources

MediStudy.com
This is a Canadian site with a comprehensive glossary of terms used in medical trials.

North American Menopause Society (NAMS)
An informational website about menopause, perimenopause, early menopause, and available therapies to ease symptoms.