iPhone Remote Control Adds Nikon Support, Auto-Focus | Gadget Lab | Wired.com:
The software is a big upgrade from the original, and adds support (at last!) for Nikon DSLRs, as well as a slew of essential new features. To use DSLR Camera Remote you need to hook the camera up to a computer via USB cable and switch it to Live View mode. Then the computer takes over and beams the video stream to your iPhone, as well as offering you remote control of the camera.