Quizzes in the classroom are great fun for the kids - use them as lesson starters or for plenary. I was recently introduced to Kahoot! for use on the iPad by the Kahoot! team themselves via twitter and I have to say Ive not used any other quiz software since!
Its free, simple to use, and designed with education in mind. It appeals to all ages of student, and with a timed challenge for each question and a leaderboard its guaranteed to engage and motivate your entire class. Whenever Ive used this with teachers excitement runs high!
Because its web-based, and not yet an app it means you have greater flexibility in using it. So, for instance, the teacher or a group of kids can create a quiz on their desktop computer - mac or PC and then ask the class to access the quiz from their mobile devices - android or iOS iPad/ iPod. Kahoot! behaves like a voting system and answers are sent back to the teachers device screen and projected for all to see.
The results can also be downloaded by the teacher for knowledge based evidence purposes.
Find out more by visiting the Kahoot! website and try it for yourself.