NATIONAL ABYSSINIAN RESCUE (also includes SOMALI RESCUE): http://www.abys.net/NAR/

AMERICAN CURL RESCUE: http://www.americancurlrescue.com

BENGAL RESCUE: http://www.geocities.com/Petsburgh/Yard/4614/

BURMESE RESCUE: http://www.burmesecat.org/rescue/

MAINE COON RESCUE NETWORK:http://www.mainecoonrescue.com

RAGDOLL RESCUE:http://www.freewebs.com/ragdollrescue/ 

NATIONAL SIAMESE RESCUE (also includes Siamese mixes, other Siamese-type breeds such as Balinese, Himalayans, etc.): http://www.siameserescue.org/

SIBERIAN CAT RESCUE: http://members.aol.com/actrose/rescue.html

NATIONAL SPHYNX RESCUE:

http://www.sphynxcat.net/Available%20Cats.htm

NATIONAL REX RESCUE (also includes listings for Sphynx and Devon Rex): http://www.rexphiles.com

COMPREHENSIVE CAT RESCUE SITES

THE CAT RESCUE NETWORK: http://www.felinerescue.net

PETFINDER (has many cats listed under "purebred" but most are mixes, however certainly worth checking) http://www.petfinder.com