Some other folks are thinking along the same lines here, and I wanted to put up some links to their work as well.
GrendelFish aka Matthew Dockrey recorded a couple of copper smelting expirments (experiment 1 , experiment 2)
Tim Young at GeoArch has been running experiments and recording data for a succession of iron smelting efforts from 1998 through 2007.
Paul French is starting a wikipedia entry that looks very promising.
Butser Ancient Farm has their 2010 workshops posted, and Making Metals with Fergus Milton on August 14 looks pretty interesting.
See something else that needs to be on this list? Let me know!