If you have a link or some information you feel would benefit us or this site, please let us know! 

United States Dog Agility Association Inc - USDAA
http://www.usdaa.com/

North American Dog Agility Council- NADAC
http://www.nadac.com/

Agility Association of Canada - AAC
http://www.aac.ca/

Australian Shepherd Club of America Agility - ASCA
http://www.asca.org/Programs/Agility/index.htm

Movie of Winston doing agility