Noteboom Productions (http://www.noteboomproductions.com) has introduced Video Tutorial for Keynote 1.0, their latest video tutorial for the iPad. It costs US$4.99 and is available in the Apple App Store.
You can watch videos on your iPad to learn how to use Keynote for the Mac. The video tutorial consists of 27 video chapters on various subjects. Users can choose different video chapters to watch as they go through the video tutorial. All videos are stored on the iPad, so no bandwidth is used while watching the videos.