So it seems that audience response systems work and can be found in classrooms with increasing regularity. As mentioned in an earlier post cost may be prohibitive in some applications. Cost effectiveness and simplicity are very important to me. So for me to use this technology I would need for it to not necessitate me to buy any new gadget and the service would need to be cheap. I think I have found a service that satisfies these two qualifiers for my adoption of the technology.

http://www.polleverywhere.com/how-it-works
Poll Everywhere utilizes the web to collect data through text messages and post them live. This method takes advantage of the almost ubiquitous ownership of cell phones, no need to buy any
http://www.polleverywhere.com/plans/Free
At least this option would allow an organization to try audience response methods without a large investment.