Know any decent 1lb size refillable.  I'm assuming if I get a coupe of those I could get one of those adapters to fill them from 20lb tanks.
I've been wondering the same thing.  I recently bought a propane Coleman camp stove (that runs on the 1lb canisters).  Would it be possible (or safe) to refill those canisters from a 20lb tank using an adapter like 
this one from Harbor Freight? 
-Robert