Question and Answer software for use during presentations

Question

I'm looking for software that will allow an audience to collectively formulate and vote-up questions during a presentation which can be relayed back to the speaker either during or after the talk. The goal would be to structure and prioritize questions from a large audience to the speaker, such as during conferences, by members of the audience using laptops and possibly smartphones.

I vaguely remember reading about a tool like this a few years ago that Google employed during their Tech Talks. If I'm not mistaken they had this running on Google App Engine. However I can't remember where I read about this, nor can I find any reference to it now.

Can anyone recommend such a tool that will allow for quick interaction from an audience with the ability to upvote questions?

Answer 1

It is called Google Moderator.

_{I know, it's a web app, but the OP asked for it!}

Also see the guide on how Google Moderator works:

Google Moderator allows you to create a series about anything that you are interested in discussing and open it up for people to submit questions, ideas, or suggestions. These are called submissions.

[...]

If you see a question that's been submitted, you can vote to recommend that it's asked. To do so, simply click the checkmark button. You can also click the X button if you'd like to vote against an existing question. When you mouse over the bars, you'll see the number of votes that have already been submitted.