Some useful links : 

The Newfoundland Club of America   NCA 

http://www.newfdogclub.org

New England Newfoundland Club   NENC  

http://www.newfclubne.org

The Norwegian Newfoundland Club  NNK

http://www.nnk-newf.com

The Bear Mountain Newfoundland Club - BMNC

www.bearmountainnewf.org

Orthopedic Foundation for Animals  OFA

http://www.offa.org

Sue Miller's Newfoundland store: 

http://www.newfoundlanddogstore.com