DragonSteelMods posted a review on the SpaceNavigator for Notebooks

With the proliferation of multi core processors, many home computers are capable of running powerful 3D programs such as Google Earth, NASA World Wind, Blender, Maya, Google SketchUp and others. Using a regular mouse with these programs requires additional inputs either with the keyboard or interfacing with on screen commands. 3DConnexion, a Logitech subsidiary, have released a portable version of their SpaceNavigator mouse line. The SpaceNavigator for Notebooks weighs in at a little over =BD pound and is portable enough to be easily packed in a laptop bag. What makes this 3D mouse different from other mice, is that it allows you to work in the X,Y and Z planes, allowing simplified navigation in a 3D environment

SpaceNavigator for Notebooks Review