Subwing
And you thought water skiing was cool. How about using that boat to drag you under the water instead? The Subwing promises exactly that. Available in fiberglass, glossy carbon fiber, and matte carbon fiber models, the Subwing is actually two wings connected to a detachable center swivel, with rubber grip pads on each wing, a rear rubber triangle for one-handed use, and ropes that attach to the wings. All you need now is a diving mask — and a boat, of course. [Scouted by Chris]