We all know that size really does matter no matter what some nice people might tell you but does length matter as well? There is no point in writing great content if nobody will read it so length does matter - line length that is - what else did you think I was talking about.
Every conference I attend I am amazed at how bad many of the slide decks are. It's not as if people are rushing them or creating them at the last minute. They have been created with a lot of time and care they just suck.
I have a few rules when I create a slide deck. If you follow them then you won't upset me, you will ensure your audience remembers the key points and you will save yourself time.