Is the age of the clicker response system coming to an end?
Web applications are cropping up that enable people to use their cell phones to vote online or through text messaging. One such service is provided by Poll Everywhere. It is certainly worth checking out. You can create a free account which allows you to use the service with 30 people. Unfortunately for me, sms is not available in El Salvador yet, and web browsing on cell phones is still quite expensive here.