Useful introduction to Markdown that makes full use of iBooks features such as embedded screencasts and audio files. Less content than I was hoping for and was a shame that I couldn't easily pause/seek on the audio excerpts. I definitely learned a couple of things and am convinced Markdown is the right way to write.
This Markdown Field Guide includes 27 screencasts. There is over one and a half hours of video in this “book”. Moreover, there are seven additional audio interviews totaling over an hour of audio content.
Line breaks are created by putting two spaces at the end of each line.
Sub-bullets are created by indenting (tab or 4 spaces)
This is, quite possibly, the future.