AGOURA HILLS, Calif. - THQ Inc. (NASDAQ: THQI) today announced a collaboration with Yamaha Motor Corp., U.S.A., the bike maker of choice for cover athlete James Stewart, to offer branded models in the next installment of the 10 million unit-selling MX vs. ATV series. As part of an awesome array of downloadable content, MX vs. ATV Alive will include a variety of Yamaha models, including the YZ450F, YZ250F and YZ125 motorcycles, and the YFZ450R ATV...