Recently, I came across this web video showing you how to connect a Nintendo Wii remote to your computer and use it with Autodesk Design Review, AutoCAD or Inventor as a 3D navigational device. This is not a bad idea considering a new Wii remote is roughly $40 and a good 3D nav is much more. This is a great solution but the only catch is that your computer needs to have Bluetooth technology.
If you are interersted, the following linkThe following demonstrates how to connect a Wiimote to your computer via bluetooth and use as an input device to control and navigate 3D CAD in Autodesk Design Review.
Talk about having too much time on your hands.