Here are a few links I have found helpful in learning about Miniature and Toy Australian Shepherds:

http://www.namascusa.com/
The North American Miniature Australian Shepherd Club of the USA
is the first parent club devoted solely to the registration, development and promotion of the Miniature Australian Shepherd (a.k.a. North American Shepherd).

North American Shepherd Association

American Stock Dog Registry
The American Stock Dog Registry was created to provide an alternative registry program for all sizes of Australian Shepherds.

National Stock Dog Registry

Field Guide to Coloration of Australian Shepherds - Great Link on coloration, traits, genetic features of the Australian Shepherds

PuppyFinder.com - The most comprehensive online resource for finding and raising a puppy. Offers useful dog related information, advanced breed selector, tips, articles and web directory of breeders, puppy services and products.