After spending a few hours at the Googleplex being interviewed about my search strategy (what a scary thought...), I was asked if I could have anything more to help me search, what would it be. I said "voice", the abilty to state what I wanted rather than type it in. Then I said that there must already be an app for that on mobile devices.
As it turns out, Google Voice does just that on mobile phones. See "Chubby Bunny", one of the best demos featuring Google Voice. Better yet, spend your lunchtime with DemoSlam by Google. If you have a large screen monitor, it would be fun for a bunch of teachers or students to watch and vote for their favorite demos.
Here's an idea: Challenge middle and high school students to create demos and submit them -- use the school library as a backdrop! Learn how to submit a demo to Google. Have a blast.