The Whamberry is great mini keyboard/input pad that connects to your computer simply with a USB plug-in dongle. It is wireless and can be used more than 30 feet (10m) away from your computer.
You can control the cursor using the touch-pad that is built-in or type with the full keyboard. The size of the Whamberry means it is small and light weight enough to carry with you and can be held in the hand or used as a complete input device if movement is limited.
The device is recharged using a provided USB cable. There is no installation needed, simply plug in the USB key to your computer and the Whamberry is ready to use.
I was unable to find specifications to ascertain what type of touch pad it uses so am not sure if it will work with a stylus/mouthstick or only a finger.
[Update Feb 2012: It came to my attention through comments that the whamberry site has either been hacked or not used anymore and instead points to spam of an adult nature. The link has been cut by me. Admin.]