This all comes from the recent lawsuit that Nintendo lost. Here are some more details on the situation...

Nintendo Co., the world's biggest maker of handheld game machines, is facing a ban on sales of some controllers for its Wii and GameCube systems after it lost a bid to overturn a $21 million patent-infringement verdict. ...Not all controllers were found to infringe the patent. Jurors agreed with Kyoto, Japan-based Nintendo that the rectangular Wii remote, when not used with the Wii Classic, and the ``Nunchuk'' controller attached to the remote don't violate the patent at the heart of the case.