[jamesfrank]

I disagree with you on the details a bit, but I think viewing this as good at somethings and bad at others is far more constructive than arguing that this should replace a mouse, keyboard etc.

However, I would make the good/bad list a bit more general: * good for manipulating UI elements that represent 3D * bad for manipulating UI elements that represent 2D

Maps and camera interactions (CAD) are perfect examples of things that represent 3D elements. Short games are another area that can represent 3D - longer games might also work well, but the user is likely to get tired of waving his/her arms around.

Much of what we do on computers today is strictly 2D. Coding, word processing, most web browsing, email, etc. Pencil tools/drawing tools are similarly usually just a 2D activity, so using a 3D-capable tool and reducing your movements to 2D doesn't really make sense.