Here are folks we work with regularly, buy plants from, ask advice from, or personally know and generally support and believe in.  Also clubs of which we are a member.
Most are links to websites.

Abbey's Eden, Grand Junction, CO
Alba Plants, Cowichan Bay, BC
A Lovesome Garden, LLC. The talented, Margie Frey has helped us several times.
Alpine Garden Society, UK
Betty Ford Alpine Gardens: Nick Courtens.  Vail, CO, Jay Ackerlay, Princeton/Vancouver, BC
Center for Resource Conservation, Boulder, CO (I donate a garden-in-a-box design for their program)
Chelsea Nursery, Clifton, CO  (Our favourite plant source, by sheer numbers)
Chinle Cactus & Succulent Society, Grand Junction, CO
Dart's Hill Garden, Surrey (Vancouver), BC
David Cristiani, Desert Landscape designer extraordinaire
Denver Botanic Gardens, generally.
Gardens by Genie, Grand Junction, CO (Facilitated us doing the KAFM garden)
High Points Nursery: Adam Burch, Denver, CO
High Desert Orchid Society, Grand Junction, CO
International Rock Gardner (online magazine)
J. C. Raulston Arboretum, Raleigh, NC
KAFM 88.1 FM- Grand Junction's Community Radio. (and site of one of our demonstration gardens)
Rocky Mountain (Denver) chapter-NARGS
Roots Medicine Gardens, Denver, CO (Helped at APEX, herbal specialist)
Scottish Rock Garden Society
Sunscapes Rare Plant Nursery, Pueblo, CO  (Supplies plants as special as Indian Paintbrush!)
Sunshine Nursery, Clinton, OK  (We buy trees from them.)
Timberline Gardens, Arvada, CO  (Late. Great.  We miss you TG)
T-4 Tree Services, Grand Junction, CO   
Wildthings, (native wholesale nursery) Pueblo, CO  (A quiet and very important native grower)