Resources
E-mail lists
Agility-equipment-products (lots of advertising, often people recommending products they sell)
Books
Kurt Glaubs E book Great reference for only $12!
Cleanruns Many plans are reprints of Clean Run magazines construction zone, but a few nice ideas, and some sharp blueprints.
Suppliers
J and J dog supply - GREAT wire jump cups
MAD agility - Cheap weaves and colored jump cups.
Atozsupply
PVC Fittings for regular PVC pipe 4way, 5 way and slip tees