Here are some resources to help you raise a happy, healthy pet:

Dogs and Cats:
Dogs Naturally Magazine
Modern Cat

Dog and Cat Nutrition:

Dog Food Advisor
Feline Nutrition Foundation

Guinea pigs, Hamsters, Ferrets, Rabbits:

The Hamster House
Guinea Lynx (Guinea pig site)
The American Ferret Association
My House Rabbit

General pet sites:
American Medical Veterinary Association

Local pet adoption sites:

Charlottesville/Albemarle SPCA
Fluvanna County SPCA
Richmond SPCA