Power to Presenters
You know how nowadays everyone loves to tweet at conferences or presentations in middle of the talk? Sometimes you as a presenter might want to return the favor and tweet something in response. If you know upfront that what you are going to present will provoke a response from audience, you can now actually put the tweets in your presenter notes and have Keynote or PowerPoint to tweet on the background while you are presenting.
Checkout Mac Power Tweet. It's really easy to use.
Even if you don't want to tweet during your presentations, you might want to check out the app to see how you can have other applications react on whatever is currently happening in your presentation. Hope you will get inspired and contribute back more goodies.