Splashtop allows you to use your tablet or laptop computer to control the podium computer from anywhere in the classroom. In addition, there are many drawing, graphing and annotation features that you can use in conjunction with pictures, the web, PowerPoint presentations and more. Check out Janet Bester-Meridith’s overview of how she uses Splashtop in the classroom.
Airplay with the Apple TV allows you to mirror your iPad (and certain other Mac devices) in the classroom. Students can see exactly what you can on your screen, meaning that you can share a variety of educational apps in the classroom.