Microsoft just announced its latest portable wireless mouse, the colorful Wireless Mobile Mouse 4000, targeting netbook users. The new mouse features the company’s latest BlueTrack technology that is said to offer superior accuracy unlike laser and optical mice.

Supposedly it beats all other mice and will perform as well or better on smooth surfaces including granite and even on surfaces like a carpet and unfinished wood. The 2.4GHz Nano USB transceiver won’t stick out more than 0.4″ from your USB port, so you can leave it in all the time.