General:

Jefferson County Fairgrounds: http://www.jeffco.us/fair/
Colorado Horse Council: http://www.coloradohorsecouncil.com 
Jefferson County Horse Council: http://www.jeffcohorse.com  
Lakewood Riding Club on Yahoo.com: http://pets.groups.yahoo.com/group/LakewoodRidingClub 

Member Sites:

Amanda Speaker: http://www.phantomdragonranch.com 
Lisa Bialy: http://www.ranchopasofuego.shutterfly.com

Other Clubs:

Buffalo Bill Saddle Club: http://www.bbscgolden.org/home
Parker Trail Riders: http://www.parkertrailriders.org/
Mile High Gaited Horses: http://www.milehighgaitedhorses.shutterfly.com