Feline Heartworm http://www.heartwormsociety.org/pet-owner-resources/feline-heartworm.html
Feline Diabetes http://www.felinediabetes.com
Feline Renal Failure http://www.felinecrf.com
What Color is my Cat? http://www.seregiontica.org/Colors/intro.htm
Cornell Feline Health Center http://www.vet.cornell.edu/fhc/
Feline Advisory Board http://www.fabcats.org