Turn your iPad into a wireless whiteboard! Annotate PDF documents and images live. You can now project PDF documents (such as exported PowerPoint or Keynote decks) to a computer on the same local network, then annotate them in real time, all from your iPad.
As far as technology itself and education is concerned, technology is basically neutral. It’s like a hammer. The hammer doesn’t care whether you use it to build a house or whether on torture, using it to crush somebody’s skull, the hammer can do either.