We built this piece out of an old bike wheel. The wheel came off of GT full suspension bike that I broke. The whole project cost around $15 from HomeDepot. There is one bolt that goes through the hub, and a coupling that links that to a bolt that is half metal threads and half wood threads. That's really about all that it takes. The pots hang off of simple stainless hooks attached to the rim and spokes.
To my knowledge this is a unique piece. I have not seen any evidence of similar pot racks being made. One person blogged about a bike wheel pot rack where the wheel was cut in half. Our design allows the hub to still function and the whole thing spins. So even if the pot you want is in the back, just spin it and it at your finger tips.
UPDATE: I have posted more detailed instructions.