Although not necessarily Breed Specific, the sites listed below can be extremely useful.
A wealth of information covering all aspects of purebred dog ownership.
A site dedicated to the advancement of canine health. Extensive database of OFA test results.
National German Wirehaired Pointer organization: Member Clubs, Breed Standard, Bulletin Board, Breed Rescue, Code of Ethics, National Breeder Listing, Breedpoint Standings
MB-F Dog Shows: online premium lists, online judging programs, online entries, and show results published online.
Dog Show Superintendent: online entries, judging programs, results
The North American Versatile Hunting Dog Association website. NAVHDA is "dedicated to preserving, improving and promoting versatile hunting dogs by sponsoring training and testing programs throughout North America."