This would be a great tool for security people that are on the move. Theoretically they would be able to control camera via their iPhone from any location. Imagine being able to instantly look into rooms prior to entering.
Adding a mobile interface to systems that traditionally required a user to be sitting at their desk will open up many new opportunities. The new touch screen interface will also change how we interact with those systems, creating all new ways to use technology.
As an example, traditional surveillance systems use a joystick or mouse to control camera positioning. With the iPhone, the user has the potential of a much more intuitive interface to drag the camera around and zoom in on things by pinching the picture.