It's been just over a week since Wii Sports Resort, bundled with the Motion Plus, was released in North America. In the past eight days, it's reported that Nintendo has sold over 500,000 copies of Wii Sports Resorts to anxious gamers.
"Nintendo has announced the early sales of Wii Sports Resort: the game, which includes the MotionPlus peripheral, has moved over 500,000 units in only eight days. A franchise is continued, a peripheral finds success, and Nintendo remains on top."
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More on this at: ars technica