Almost EVERYTHING you ever need to know about house rabbits can be found at the website for the National House Rabbit Society at http://www.rabbit.org/. This site has a great search feature on the main page. Simply type in a keyword for the topic you want to learn about (for example, type "litterbox" if you have questions about litterbox training), and all articles regarding that topic on the website will be listed for you.
Listed below are links to informative articles on other websites:
HRS Veterinarian List Links to veterinarians recommended by House Rabbit Society chapters throughout the U.S.
PetBunny Veterinarians Veterinarians recommended by members of PetBunny, an online community of pet rabbit caretakers.
Rabbit Diet & Intestinal Problems
GastroIntestinal Stasis, The Silent Killer: A must-read article for all rabbit owners. GI stasis is one of the leading causes of death for rabbits, but with proper diet and treatment, it can be prevented and/or treated.
Toxic Plant List List of toxic plants, compiled by the California Poison Control System
Animal Poison Hotline: A new 24 hour hotline is available year round to pet owners and pet caregivers who are concerned about their pet's well being after ingesting an unknown or toxic substance. Call 888-232-8870. $45 per case.
First Aid Kits
Bunny Emergency Kit Posted on etherbun by member Laura Tyler, this is a detailed list of items rabbit caretakers should have on hand.
The Language of Lagomorphs: (What Your Rabbit is Saying and How to Speak Back) An informative and enjoyable website which will help you understand your bunny's behavior and give you tips on how to effectively communicate with him.
http://www.petloss.com/ Probably the best known and most active website for petloss. Has the famous Rainbow Bridge Poem, and coordinates a weekly candlelighting ceremony for pets who have passed over to the Bridge. Be sure to have a tissue handy...anyone who has ever loved and lost a pet will be touched by the poems.
KW Cages Manufactures cages and pens, and can custom build to your specifications.
Leith Petwerks Manufactures multi-level cages designed specifically for house rabbits.