An interesting iPhone / iPad app has been launched through iTunes
App store. With iDevCam you can control the virtual camera inside 3ds
Max! You can move, rotate and drive your virtual camera by simply move,
rotate or drive your iPhone / iPad.
No more need of a multi-dollar equipment to control your 3D virtual camera.

I'm having a hard time und
I'm having a hard time understanding how this could be beneficial.
How/why would you use this?
http://grinnerhester.com
In case you want to animat
In case you want to animate your 3D camera on the fly and real time (to be a virtual cameraman) instead of tweaking camera keyframes inside 3ds Max. Peter Jackson did it in the LOTR I (the cave troll battle scene inside the ruins of Moria) actually not with this app but with a lot more expensive equipment. I think it is a great app!