Medical Journal of Australia
Website: http://www.mja.com.au

British Medical Journal
Website: http://www.bmj.com

Journal of the American Medical Association
Website: http://www.ama-assn.org

RACGP - Australian Family Physician
The peer reviewed journal of the Royal Australian College of General Practitioners.
Website: http://www.racgp.org.au/publications/afp_online.asp

University of Toronto
Resource and Development Research Base (RDRB).  Approximately 8000 papers and resources (annotated) in continuing education for health professionals
Website:  http://www.cme.utoronto.ca