Save your thumb. Buy the Craftsman Nextec Hammerhead Auto Hammer ($100). Without ever taking a swing, this innovative tool hammers up to 3.5-inch nails with just the pull of a trigger. Powered by a 12-volt Lithium-Ion battery, the Hammerhead works great in tight spaces and is perfect for the extremely lazy. It nails at 2000 impacts/minute, and a retractable nail sleeve and magnetic head let you do it one-handed.