Mayo Clinic
Mayo Clinic: Food Borne Illness
This site from MayoClinic.com provides great information on food-borne illness. The article is somewhat brief, but provides an excellent overview on the subject.
Aetna Intelihealth
Aetna: Inteli Health: Food Poisoning
Thorough overview of food poisoning. Includes information on symptoms, prevention, treatment, and much more.
Other
Virginia State Department of Agriculture/consumer Sciences: About Food Poisoning
This site about food poisoning discusses Staphylococcus Aureus - what it is, where the common sources of "staph" are, common symptoms, and what can be done to prevent contamination and infection.
US Food and Drug Administration
Fda: Bad Bug Book
Downloadable listing of bacterial foodborne illnesses, including clostridium perfringens. Worded so kids can understand it and includes pictures.