I just ran across this website Poll Everywhere | Simple Text Message (SMS) Voting and Polling, PowerPoint Audience Response System (ARS) ( no affiliation whatsoever ) and I really felt like sharing.
The guys put together a system where in lecturers/seminar organizers can purchase a plan that provides them with a set of SMS numbers that can be used in a poll.
These numbers are then provided to the lecture/seminar attendees to vote on an issue - so it's in effect an automated, live poll where participants vote by sending votes via SMS.
The results are shown in Powerpoint or in a browser, whichever you prefer.
Now that's what I call innovation - only possible with the Internet. I find it quite inspiring.