Plickers is a website and app that you can use with your mobile device (I had to get a little creative to get it on Mini-I download it on my computer, and then when Mini synced with iTunes, it appeared).
You project your questions on the board, and the students hold up their cards with what they think the answer is.
Plus, questions are saved, and you can view reports of the questions.
Plus, my kids cheer when I say it's time for a Plickers question- they love the kids and seeing their name checked off! :)
Smiles and Sunshine,