Despite being billed as "state of the art", the Mouse-GPS uses a cheaper 16-channel receiver instead of the industry standard 20-channel SiRF chipset. It has retractable USB cable and optical scrolling, which is nice. Still, I can't help wondering about the basic design: is it really a good idea to put a GPS receiver where the antenna will be covered by your hand when using the mouse?

Looks like this mouse sells for $99 standalone, or $130 with Microsoft's Street and Trips program. More info available on Deluo's product page.