Resource: MD Explorer
Interesting aggregator RSS Feed Service of Numerous Medical Journals:

New England Journal of Medicine 
Medscape
Merck Manuals
British Medical Journal
PLoS Medicine
Academic Medicine
American Academy of Family Physicians
AHA Journals
International Journal
National Institute of Health
Centers for Disease Control and Prevention
Food and Drug Administration
Allergy
Cardiology
Critical Care
Dermatology
Emergency Medicine
Endocrinology
Gastroenterology
Surgery
AIDS
HEMATOLOGY
Infectious Diseases
Internal Medicine
Nephrology
Neurology
OBGYN
Ophthalmology
Orthopaedics
Pediatrics
Psychiatry
Pulmonary