There are a few apps for the iphone as an input device, but none that do as you are asking. But a virtual trackball with zoom and pan to mimic the space navigator would certainly seem feasible with multitouch and wifi (though I would prefer blue tooth myself for portability) even without the accelerator in the iphone. I use the Space Pilot with my left hand and mouse with the right, but having a Space Pilot with a numeric keypad added would meet all of my design needs. Again, something that could be done with an iphone.

Look to the Apple tablet/slate when it arrives to become a full fledged touch input device for apple macs.

tom

Can you call your wife on it ?

It's great. Last year when i was on PCLinuxOS i used it to manipulate/rotate/orbit drawings in ViaCAD in Vista in VirtualBox. Too bad the driver install is such a PITA (for me, at least) as it needs to talk to the kernel.

When i upr... sidegraded to Mandriva i had issues (or i got lazy?) but now i am not using it much because the cable/wire interface at the aluminum housing of the Navigator is delicate. Since i used to carry it a LOT in my backpack (in the original conformal plastic shipping protector) i would wind the wire up and stuff it as shipped from the factory. But, i quickly tired of the weight and of the wire wrapping because i don't want to destroy it the way i did my laptop's original power supply.

But, it IS a very nice device, despite a coworker who says he could do all that in ACAD 2008/(9?) without using the hardware, and not that 2010 is out i think he's even more certain. But i prefer a device off the side of the keyboard so i can avoid moving my hand to keys all the time even though i can touch type.