In 2009, U.S. Xbox 360 console sales topped 10 million units, with more than 1.3 million sold in December, contributing to a worldwide Xbox 360 install base of 39 million. Those numbers are crazy, and on par even with Wii!
Read more @ http://www.wired.com/gamelife/2010/01/december-npd-spin/#ixzz0cfyAcbyP