Everyone needs a wireless mouse these days and Macally has some great choices in their Pop-Up Mouse series.
The height-adjustable 3-button mouse works on both Mac and Windows systems and comes in both a USB and Bluetooth model
To adjust the height, simply press the pop-up switch on the bottom and the mouse is instantly elevated for those who like that comfort.
The Bluetooth version is powered by two AAA batteries (included), which are loaded in a battery compartment on the bottom of the mouse.
For the USB version, users simply connect the connector to any available computer port. When it's not in use, there's a storage compartment on the bottom of the mouse.
Details: www.macally.com, $39.99