Want to poll your audience without clickers?

Want to poll your audience without clickers? Have them use their cell phones.
http://www.polleverywhere.com/
Poll Everywhere is a simple text message voting application that works well for live audiences. People vote by sending text messages (or using Twitter) to options displayed on-screen. The poll that is embedded within the presentation or web page will update in real time. Advanced uses include texting comments to a presentation, texting questions to a presenter, web voting, and SMS interactivity in print, radio, and TV.