Navigator could be 3D life-saver
Alternative device is meant for your mouse-free hand
It may look like an air hockey mallet, but don't laugh--it could be your survival guide if you get lost in Second Life.
Using six optical sensors, the navigator isn't a replacement for a mouse but is intended for use in the mouse-free hand. You can move through a 3D space by gripping the top of the SpaceNavigator and sliding it around, twisting it like a dial, tilting it, pressing down on the center of the mallet or slightly lifting it.
Just be careful not to get carried away with it, as some gamers have done with.