Nyko Wand+

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For demanding gamers, initial excitement upon procuring a Nintendo Wii was quickly dampened by disappointment: the durned Wiimote wasn't nearly as precise as we'd all hoped it would be. It took a couple of years for Nintendo to step up and fix the issue, releasing the MotionPlus and finally making the Wiimote work for sword-fighting games and the like. But, that left us all stuck with a dongle hanging off the bottom, causing compatibility issues with many early peripherals. The Nyko Wand+ is the solution, putting the MotionPlus right inside a stock-size controller, as it should have been in the first place. In some ways, it's better than first-party.

http://www.engadget.com/2010/09/08/nyko-wand-review/