Poll everywhere is a 3rd party Twitter application that works with PowerPoint, you can also embed it in a web page. It could be used realtime with your students. You can create multi-choice questions and get feedback right there in the classroom or you could be more creative and set activities outside of the classroom. The thing I love about this application is it can be used anywhere as the name suggestions. It takes the learning outside of the classroom.
It's a pay service but offers a free version for use with up to 30 participants. I thought this was a very generous offer. Students can SMS the answers but it may not be free. It is free in Australia but I couldn't find anything which said SMS service in NZ was free.
3.05 pm update: Sorry spoke to soon, if you haven't read my previous post Twitter update (SMS) from Vodafone network is now free in New Zealand. This means you can send and receive 200 sms/month from twitter for free. This also means Poll Everywhere is then free and to send your response to any Poll Everywhere Multichoice poll send it to this number 8987 with the message @poll CODE
Poll Everywhere also allows you to create short answer quiz/poll, of course this is limited to 160 characters (same as sms). Again you respond to any Poll Everywhere Short Answer poll by sending a sms to 8987 with the message @poll CODE Answer
Link to the main page: Poll Everywhere
Using Poll Everywhere
Try it out!
Text a code (one of 38101, 38102 or 38100) to 8987. Wait for a while and the graph should update.