Smartfish has released their Whirl Mini mouse which is supposed to support the user’s wrist.
Using the patented ErgoMotion technology, the Smartfish Whirl Mini mouse defies gravity, rocking backwards and forwards and leaning left and right so that the mouse is able to adapt to your wrists form.
This wireless model communicates with the computer thanks to a micro-USB receptor. It also comes with a laser sensor with 1 600 dpi sensitivity, left and right buttons and an integrated wheel which can be clicked to provide vertical scrolling.

The ErgoMotion technology in action (click to enlarge)
It has also been designed with the ambidextrous in mind, with the device adapted to both the left and right hands. The device comes in six finishes of metallic white, metallic blue, charcoal, grey, metallic black and metallic red.

The six available colours (click to enlarge)
Compatible with Windows (Windows XP and later) and Mac OS (Mac OS X 10.2.8 Jaguar and later), this wireless mouse retails for 49,95 dollars.