Medscape
Medscape is a free resource for Physicians, featuring Free CME (Continuing Medical Education), medical journal articles, MEDLINE, medical news, major conference coverage, and comprehensive drug information.
eMedicine
eMedicine features up-to-date, searchable, peer-reviewed medical journals, online physician reference textbooks, and a full-text article database in 62 medical specialties. This largest and most current Internet medical library and clinical knowledge base is available to physicians, medical students, nurses, and other health professionals free of charge.