This web site, with the goofy name FleshAndBones.com, is an Elsevier Ltd. property (the publishers of the Lancet). It features more than 30,000 clinical images from all areas of medicine.
The images are from leading medical textbooks like:
Clinical Medicine, Kumar and Clark
Forbes Color Atlas and Text of Clinical Medicine
Davidson's Principles and Practice of Medicine
Hutchinson's Clinical Methods
Atlas of Diseases of the Kidney. Robert W. Schrier (not part of the series)
The illustrations have background watermarks but are sill readable, and can be very useful when reviewing for ABIM or USMLE. See our tips on how to pass the boards here.
There are also several books with completely free images (no watermarks), which are available for download, after a registration.
MerkMedicus.com features the Braunwald's Atlas of Clinical Medicine, which is free online, if you are a U.S. health care professional.
How to Do Well on the Boards?
Medical Image Databases on the Internet - UTHSCSA
Atlas of Diseases of the Kidney. Robert W. Schrier.
Netter's Illustrated Human Pathology: A Searchable Collection of Images.
Image source: Wikipedia