Meet the SUV of computer mice. Microsoft's new BlueTrack technology means you can use the Explorer and Explorer Mini mice nearly anywhere. Marble, granite, wood -- the mice work smoothly on them all. Trust me, I've seen this mouse in action. I tried it out on gritty, dirt-covered concrete, on the arm of a sofa, even on the PR rep's hair! Hair! And there was smooth tracking on it all -- no jerking, stops or lifting and shaking. Now, so what, why would you ever run your mouse along your head to surf and click the web, right? You're right, you probably wouldn't, but you would use it on a granite kitchen countertop, one covered in crumbs perhaps. And maybe your kids would enjoy being able to lounge on the floor of the family room with their laptop and use the mouse on the carpet. Just saying, it's pretty cool. Microsoft Explorer Mouse, $89.95. Microsoft Explorer Mini Mouse, $69.95. Available Nov. 1st at: Best Buy. Major electronics retailers.  Microsoft for info.