About.com – several rabbit articles including care and health
ASPCA.org – great basic rabbit care article
House Rabbit Society – link to their care page, excellent resource
My House Rabbit – excellent site with tabs for care, health, and behavior
Peteducation.com – numerous articles on Rabbit care and diseases
Petplace.com – searchable article listing on rabbit care and diseases
The Bunny Basics – good tabs on care, health and facts