The
Razer Boomslang is the coolest mouse on the
planet. The mouse you are most likely using has 200-400 dots per inch(dpi), making it suitible for most tasks. The
Razer Boomslang has 2000 dpi, making it an outstanding tool for
PC work.
Primarily marketed as a gaming mouse, for first person shooters, it fulfills that role with flying colors. It is the smoothest, most responsive pointing tool I have ever been fortunate enough to use.
I also use it every day at work. I am a professional geek, so I spen a lot of time mousing. My setup consists of two 19' monitors running at 1600x1200 pixels, giving me a total of 3200x1200 pixels of desktop space. Turned all the way up, my boomslang can go from one end to the other in less than an inch, which translates into phenomenal control.
As cool as it is, it costs $100(USD), which puts it out of reach of all but the most ardent gamers/mouse fanatics. If you are thinking of getting the MS ballless mouse, blow the extra 30 bucks and get the Razer Boomslang instead.