Evoluent Vertical Left Hand Mouse 4

The Evoluent Vertical Mouse 4 Left has a patented shape that allows you to use in a relaxed handshake position and generally avoiding forearm twisting. A fast adjustable 800 - 2600 dpi optical sensor reduced hand movements needed to move the pointer. Easy clicking but firm enough to avoid accidental actuation.  6 Programmable buttons have 59 selectable functions each plus special features for scrolling and clicking to ease the workload.

The new features of the Vertical Mouse 4 are
Improved Thumb Rest: - The thumb rest has been reshaped to provide even more comfort over earlier versions.
Now Two Thumb Buttons: - A new bottom thumb button provides greatly extended functionality when used with the included driver.
Extended Lip prevents Rubbing - An Extra wide lip along the bottom edge prevents the last finger from rubbing the desk

Compatibility
PC - Windows XP, Vista, 7 32/64 bit. Driver not required for basic functionality but buttons are programmable with driver installed.
Mac - OSX or newer without a driver (basic functionality) a Mac driver is coming late 2010
Linux - Basic functionality without additional driver
USB only