JAMA Collections
http://jama.ama-assn.org/collections/

NEJM Collections
http://content.nejm.org/collections/

British Medical Journal Collections
http://bmj.com/collections/

Mayo Clinic Symposia - just the order form for print versions as pdf file
   (need Adobe Acrobat Reader)
http://www.mayo.edu/proceedings/form-e.pdf

Cleveland Clinic resources (not Symposia, but still useful)
http://www.clevelandclinicmeded.com/

Cleveland Clinic - most recent issue
http://www.ccjm.org

Postgraduate Medicine Index
http://www.postgradmed.com/back.htm

eMedicine - by specialty
http://www.emedicine.com/specialties.htm

Family Practice Notebook (a little like eMedicine)
http://www.fpnotebook.com/

Lots of online medical journals, courtesy of eMedicine
http://www.emedicine.com/journals.html

American Academy of Family Physicians - Index
http://www.aafp.org/x13556.xml

Patient Care Online - Index
http://www.postgradmed.com/back.htm

The Physician and SportsMedicine
http://www.physsportsmed.com

Seminars in Medicine (Turner-White): Competency Collection
http://www.turner-white.com/smp/smp_topics.php#Evidence-