Clicker Software that works with iPads, mobile devices and simple web browsers:
http://www.clickerschool.com/

There is a fee for this, but may be cheaper than buying clicker sets.
-M. Broach




iPad Basics is a nice place to get started if you're new to using your iPad. It includes videos and interactives.
http://www.gcflearnfree/ipadbasics

-M. Gowen


Here are two apps that will allow wireless iPad projector display:
1) Reflection - http://reflectionapp.com
2) AirServer - http://www.airserverapp.com

-M. Gowen