After some Googling, I found this product, Oenophilia Fusion 16-Glass Stemware Rack, available at Amazon for $33 with free shipping.
How cool is this dryer rack? For spending merely 33 bucks, not only you will now be able to dry a decanter properly, but also able to dry up to 16 normal size glasses at the same time. One more advantage of this rack over others is that the legs can be folded flat for easy storage.
(OK. OK. If you use the Riedel Sommelier or the “O” series glasses, then this rack won’t work for you. However, if you plan to use these types of glasses, then you are into another drinking league anyway)
So there you have it, please add this useful tool onto your holiday wish list.