I tried something new in class today - Plickers!
It's like the CPS "clickers" except you don't have to pass out clickers, just paper cards that have a code that students twist to choose multiple choice answers.
It's easy to install and I used it for a formative assessment and had the data in seconds. The students thought it was fun too.
I used it with my Kindle Fire HD, but most teachers I talk to use their phones. The display is bigger on the Kindle so it reads faster.
Try it - it's new, different and not that much set-up.