Haiku Deck is a very friendly and easy to use iPad app that helps you to create beautiful presentations. It is so smooth and easy use that creating presentations actually becomes a joy.
It allows for just two lines of text per slide and as you type the text size changes so that it is always filling the slide horizontally. The idea is that the viewer shouldn’t be reading long paragraphs. It should be short and easy to read while the speaker still delivers the main content.
iClass - Technology in the Classroom 