I like all of the suggestions mentioned. I especially agree with the staying calm one. Random problems will arise and if you remain calm and flexible, the students will follow suit. I never thought issues such as the caps lock being stuck on would happen, but it will. It is important to these small issues, so that you have documentation for later.
I also really like the "Ask 3 and then me" rule. It really helps to make things move smoother overall. Some students think that they need to get all the answers to their questions from you right at the moment they have the question. I encourage students to view each other as "little experts" in different areas and ask each other for assistance. It will help you keep your sanity. Also, I encourage students to use the Internet for answers to their questions.