International Disc Dog Handlers Association - IDDHA 
http://www.iddha.com/

Greater Jacksonville Disc and Dog Club
http://www.k9frisbee.com/

National Capital Air Canines - NCAC
http://www.discdog.com/

The Dogpatch Frisbee Dog Page
http://www.dogpatch.org/dogs/frisbee.cfm

Disc Dog E-Mail List Group
Frisbee dogs, flying dogs, or disc dogs, it doesn't matter what you call them, this is the email list for enthusiasts of those awesome high flying canine athletes.   K9 Frisbee - Dog Frisbee and Canine Frisbee - Disc Dogs.  This list is dedicated to discussions concerning all aspects of canine Frisbee and the growth of the sport of canine Frisbee.  NO other posts will be accepted.  You must have a completed profile that includes your full real name to join this list.
http://groups.yahoo.com/group/discdoglist