The hottest gaming accessory of the 2010 holiday season, Microsoft Kinect, is now available across the globe. Microsoft’s new motion-based video game controller for Xbox 360 is set to take the world by storm. Analysts almost unanimously expect it to be one of the best-selling accessories this holiday season, and Microsoft recently raised its holiday sales projections from 3 million to 5 million units. Here’s what you need to know: if you have an Xbox 360, you need Kinect. If you need Kinect, you also need to get moving because purchasing one will be increasingly difficult as we approach the holidays.