The Logitech MX Air from Amazon.com “tracks motion even after you lift it off the surface, making it great for home theater PC users and presentations.” Video after the break. Product page. Click here for first picture in gallery.
The Gyration mouse is also significantly heavier which is subjective by taste. At $149 the MX Air is expensive so this really is a case of form over function. After a week using the MX Air, I�m pretty happy.