This article says it's 1.3m in 10 days.
The Xbox 360 Kinect is flying off retail shelves worldwide with a reported 1.3 million units sold in the first ten days since launch. Those 1.3 million units have raked in a cool $250 million in revenue for Redmond’s camp and officially thrown the Playstation Move into the rear-view mirror.
I trust his source.







