Farallon Portuguese Water Dogs: http://silverdog.net/

This is the site of Gail Browne-McDonald, co-breeder of Jetta.  Gail is a tremendous resource for information about breeding PWDs and evaluating puppies for temperament and conformation to the standard.

Rustyco Portuguese Water Dogs:
http://rustycopwds.com/

This site belongs to Julie and Ty Rust, breeders of PWDs in Stockton, California.  In addition to featuring a beautiful gallery of their dogs and puppies, their website provides valuable information about the breed and ownership responsibilities. 

Specialty Supplies  www.4mypwds.com

This site is great for finding resources on PWDs and for purchasing all kinds of items for your pup.