Motion sensor technology is one of the keys to Nintendo Wii's success, but the world's best-selling video game console could lose its title if its technology becomes more commonplace. And one Maryland tech company could bring an end to U.S. Nintento Wii sales. Hillcrest Laboratories claims it holds the patent for motion-sensing controllers, a key to the Wii system. Hillcrest filed a complaint with the U.S. International Trade Commission and has filed a lawsuit in federal court, asking it stop the import of Wiis to the U.S. Hillcrest makes its own motion-sensing controller for TV browsing and other purposes.