On the most recent show (Feb 13, 2010), one of the contractors was driving nails with a spherically shaped impact driver. The sphere fit right into the palm of his hand.
Does anyone know what this tool is called or where I can buy it?
Yep sounds like a palm nailer, Lowes and Home Depot or Harbor Freight for sure, but u might find it at ur local hardware store if they carry pnuematic tools. Tool has limited uses, but does a great job for those tight spaces.