Here are some great resources on the web for you to explore.

Australian Cavy Clubs

Australian National Cavy Council
Cavy Council Of Victoria
NSW Cavy Club
Queensland Cavy Council
Cavy Owners and Breeders Society
Hobart Cavy Club
Southern Cavy Club of SA


Resources

Guinea Lynx - an excellent reference site for guinea pig medical and general care information
Peter Gurney's Guinea Pig Health Guide