These are a few of my favorite things:
Laser Pointer and Presenter Remote: The presenter remote may eventually get discarded for some type of app on the iPhone or presentation directly from the iPad. However the laser pointer I use constantly. I point at signs, directions, particular parts of what we are working on, and much much more. I find it extremely helpful to be able to communicate information to students without speaking and when not near them as well as make it clear exactly what I am referring to in a diagram or student work. My signs are made much more effective by the laser pointer.