Wilderness Medical Society: A membership organization of physicians, nurses, physician assistants, EMTs and other first responders concerned with the health and safety of individuals in the wilderness. Hosts several conferences a year.
High-Altitude Medical Guide: Provides current medical information on the prevention, recognition, and treatment of altitude illness, as well as other health issues affecting travelers to high mountainous regions of the world.
The Survival Medical FAQ: Part of a survival web site. Not strictly wilderness medicine, but an adequate orientation for anyone not already trained in emergency medicine. Lists of books for the layman who may have to go it with out a physician.