http://www.clickertraining.com (Karen Pryor Clicker Training)

http://www.apdt.com (Association of Pet Dog Trainers)

http://www.clickersolutions.com/articles/index.htm#ccrca   (many great articles on clicker training)

http://www.sitstay.com (SitStay, one of the best online sources for everything related to dogs!)

http://www.positivepetzine.com (a wonderful newsletter and informative blog site for positive dog training)

http://www.svbt.org (the Society of Veterinary Behavior Technicians)