I came across this link to one of my favorite blacksmithing videos. Jim Poor explains and demonstrates how he makes his farrier tongs from 3/4" round. He shows hammer and anvil technique and power hammer technique.
I had the pleasure of seeing Jim and Kathleen demonstrate at the Saltfork Craftsmen Conference in Guthrie, Oklahoma in October 2001. They are remarkably talented and great show persons. They own and operate Flatland Forge in Midland, Texas.