A range of tools using Powerpoint and Adobe Flash including twitter feedback slides, Powerpoint auto-tweet, Powerpoint twitter voting. From Noeline Wright's speed seminar.
backchan.nl is tool for involving audiences in presentations by letting them suggest questions and vote on each other's questions. backchan.nl is intended for conference or event organizers who want a new way to solicit questions from the audience and make better use of question and answer time.
Looks quite neat.
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Let your audience decide
Get to know your audience by letting them decide which questions, suggestions or ideas interest them most.
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Everyone's voice is heard
The voting box at the top of page focuses attention on submissions recently added and on the rise, making it simple and easy to participate.
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Be creative
Include people in your preparation for lectures, interviews and hard decisions or work together to organize feature requests and brainstorm new ideas.
"Get to know your audience by letting them decide which questions, suggestions or ideas interest them most."<--new-to-me google tool, useful for feedback?