Poll Everywhere is a resource that I had been hearing about for a while and decided to try last spring with one of my classes. Students were excited about being able to use their cell phones without getting in trouble, and they really enjoyed seeing instant feedback as their answers popped up in real time on the Smart Board. It's very easy to set up polls, and I recommend this as part of a class starter or a class wrap-up activity. A few words of caution, however: make sure that students have free texting before they start answering your polls. Also, depending on the maturity level of your students, you might want to stick with multiple choice or number responses, and steer clear from polls that allow students to text random words and phrases.