As a new instructor, I found it quite scary to be in front of a large class. Also, I was limited to the corner of the room because of my power point presentations. I had to be able to click the mouse on the computer to advance a slide. So what happened? I bought myself a wireless mouse. Now I can move around the room when I speak. I find that some students learn better if they can see the instructor better. It has helped several of my students who sit near the back. It also is helping me with several problem students (talkers/sleepers) because I can lecture near them to prevent these behaviors.