http://sphotos.ak.fbcdn.net/hphotos-ak-snc4/h...5273_n.jpg

Interesting.

Edit:

Detailed Specifications:
-Ergonomic, sweat-proof shell design
-Solid 4-way mouse wheel system with ultra durable assembly
-Adjustable 7x10g weight tuning system
-Sensor: AVAGO ADNS-3090 w/PureTrak customized lens system for reduced lift-off distance
-Lift-Off Distance: 1.8mm - 2.3mm (surface dependent)
-Frames per Second: 6400
-Inches Per Second: 60
-Dots Per Inch: 800/1600/2400/3500dpi (3500dpi maximum, no interpolation)
-Maximum Acceleration: 20G
-PerfectGlide performance enhancing mouse skates pre-installed
-1,000Hz (1ms) USB polling rate
-Connector: USB
-Buttons: 5 w/OMRON D2FC-F-7N switches
-Dimensions: 117x75x45mm
-Cable length: 7ft/2.1m
-3 Year factory Warranty with optional 2 year extended warranty (max. 5 years)
-Operating System: Win2000/XP/VISTA/7 or Mac OS X v10.2 or greater

http://www.puretrak.com/