3dxtreme.org got their hands on one of the tightest mouses I've ever seen.  The Logitech Mouseman MX 700 Cordless Optical, the second generation of optical mice that has virtually flawless performance when it comes to accuracy.  My porn surfing producitivity would go up 20% with one of these bad boys:

"For most computer users upgrading their hardware is a recurring and costly event. One product that has remained with me now for quite awhile is my trusty Microsoft Optical Mouse that I have been using for a few years now. This mouse dates back to my Intel p3 650 mhz machine which was my main rig about 2 years ago. Recently however, mouse technology has made strides and today we have the privilage of reviewing the new Logitech® MX™700 Cordless Optical Mouse. This new mouse from Logitech not only brings updated optical technology (800 dpi) to the market but also updated cordless technology. Previous wireless units were unreliable, slow and tended to eat batteries. "