Check out this handy tool for extension of classroom discussion.
When I checked out Linda Straube's post, I notice that Arne Duncan is taking questions for the State of the Union Roundtable/ on Google Moderator:
later, I ran across a tweet about a video tutorial for this tool which seems very simple:
Google Moderator - video tutorial
It seems quite easy to set up. I asked the creator, Mark Wagner, Ph.D, what software he used to create the tutorial and I hope he responds because it was quite good.