Animal Health, Emerging Animal Disease (AHEAD) - Federation of American Scientists' project for proactive surveillance of zoonoses and other animal diseases. Includes information on rabies, West Nile fever, ehrlichiosis, equine encephalitis, anthrax, Pfiesteria, "mad cow" disease, deformed frogs, and diseases of both wildlife and farm animals.
AVMA Public Health Information - Publications and links from the American Veterinary Medical Association on "Mad Cow Disease", psittacosis, rabies, and other zoonoses.
CDC - Healthy Pets, Healthy People - Directory of zoonotic disease related factsheets, articles, prevention tools, resources, and news reports.
State of Washington Zoonotic and Vector-borne Disease Program - Provides technical assistance and training to local health departments, veterinarians, and the public on the transmission, prevention, control, and epidemiology of diseases transmitted to humans from insects and animals.
Zoonotic Diseases Tutorial - Zoonotic diseases are diseases caused by infectious agents that can be transmitted between (or are shared by) animals and humans. Features detailed information on many of organisms.