Maybe I'm a little late but this is my 1st time hearing of such a thing.

Brothers Dann and Brian Battistone have created a double-handled racket dubbed "The Natural." The brothers say the two-fisted approach from both the forehand and backhand side produces more powerful shots than a conventional one-handed stroke. Playing with the racket, they say, also creates a more stable base, or stance, from which to hit.

here's the video, check it out!

http://www.youtube.com/watch?v=BzNr90XZ05A