There is certainly no shortage of Wii controllers on the market today. Most of the accessories that we see for the Wii tend to be holders that you put your Wii remote into to allow control of games with more realism. Some controllers out there have all of the hardware needed for controlling games and interacting with the Wii on the inside though like the new Shinobii ping-pong controller.
The Shinobii controller is called the TT Champion Bat. I had no idea that the real name for a ping-pong paddle was a bat. The controller is sized and designed to look just like a real ping-pong paddle and is designed so the player doesn't need to put a Wii Remote into the controller to play. The hardware for interaction with the Wii and MotionPlus compatible game sis all integrated into the paddle.
The TT Champion Bat XtraMotion technology inside allows the player to control the paddle movement, torque, spin control, and more directly from the paddle. Power for the controller comes from a rechargeable battery. Shinobii will offer the controller in the EU and America "soon" for $69.99. That is a lot of money for a Wii controller, but serious Wii ping-pong fans might not be able to resist.