The Golfer’s Footprint could be one of the more useful things I’ve seen. It sits on the ground and, while you stand over it, gives you a visual guide to the swing path. I know that when I’m hitting the ball well, I can visualize the club’s path through the ball before I begin my swing. Having this one the ground when I practice could really ingrain the image into my mind.
They should send me one for a review.