Had Microsoft introduced the Explorer Mouse two years ago, we might have shrugged. At that point, optical and laser mice were more than sufficient for desktop PC users, even gamers. Now that many people have more than one computer, at least one of which typically a laptop, a mouse with a new sensor that works on more surfaces suddenly seems relevant. For roughly $70, Microsoft's Explorer Mouse will give you that flexibility, by virtue of its proprietary BlueTrack sensor. You can find more fully-featured mice for your desktop, but none that work as well on the living room carpet.
The Explorer Mouse is one of two products released this year from Microsoft using an internally developed sensor technology called BlueTrack. Marrying the accuracy of laser mice with the wide-area projection of optical mice, BlueTrack gives you the ability to use the Explorer Mouse on the reflective and rough-textured surfaces that would give other kinds of mice trouble.