ブルートラックテクノロジーのマウスが解禁
http://www.microsoft.com/hardware/mouseandkeyboard/productdetails.aspx?pid=001
Microsoft BlueTrack Technology combines the power of optical with the precision of laser for remarkable tracking on more surfaces*.
Allows your mouse to work on more surfaces—including granite, carpet, and rough-grain wood.
とのこと。