This is just a short note for those who may be relying on Multimarkdown documents at some point in there writing workflow. Aleh mentioned in one of his earlier post that he was using Byword and of course there are a number of other lightweight apps for writing up ideas in a no-distraction manner (e.g., iAWriter, Writeroom). If you are looking for a somewhat more sophisticated solution, I recommend that you check out Ulysses by the Soulmen. It offers some novel features which, quite paradoxically, will enhance your minimalistic writing experience.
For one thing, Ulysses has a Library of “sheets”, similarly to Scrivener, so you do not need to save and switch between individual documents, but you can simply click on a “sheet” to edit. The second important feature, which makes Ulysses convenient to use is that it stylizes multimarkdown text. So when you enter **important**, Ulysess does make it bold automatically. The same is true for headlines, lists etc. These visual clues make multimarkdown text even easier to read. What is especially nice is that you can freely configure these visual clues to your liking.
On a related note, what I also found very handy is that Ulysses allows you to change the editor font/line spacing/line width for both the regular and full screen editing mode. Some other apps are more restrictive in this respect and while the point is to keep writing simple, I find it useful for instance to be able to use my favorite editor font (Courier New) with appropriate line-spacing.