I find myself having to just imagine the narrative that goes along with most presentation decks you find on the internet. Videos of conference talks take too long to watch. I finally had enough of this situation and worked out how to dump out Keynote presentations along with their embedded presenter notes. This script emits HTML that looks a lot like how @idlewords shares his decks, and it also makes a nicely formatted PDF.
Example output: http://pushtrain.club