Michele over at The Scrap Shoppe offers this handy trick for hanging picture frames: hammer a nail through a clothespin and use it to determine nail placement. Simply hang the picture on the clothespin nail, figure out where you want to place the frame, and then push the clothespin into the wall to make a small indent. Voila! Target acquired.
Picture Frame Hanging Tip (via Lifehacker)
P.S. Last month we shared a similar trick that uses toothpaste.