I’d just like point you to several Markdown extensions added at Rhythmus to support creation of beautiful printed and online magazines from one source. A quote from their article “Beautiful on all devices (including paper)”:
With our Markdown extensions, adding a subtitle is as easy as adding a line starting with a colon (:). The pen symbol () indicates that the line contains the article’s author(s), optionally followed by their :twitter: @username, from which a clickable link will be created automatically. When the article needs an intro text, the first paragraph gets a summary symbol (∑), while prepending a paragraph with a bold quote mark (❝), will turn it into a a pull-quote. We are still adding many more element classes, like mathematical equations, image galleries, slide-shows and interactive graphics.