Your comments

@Ted, it may be okay to do so on a Mac but not all OS's are equal, though dir trees can be. That said not all work flows are equal either.

If a tree view was a hotkey away the use of a mouse diminishes. Couple this with the possibility of tabs and we open up a world of ease.
I recently tried to link to a file on disk using relative links [Mentioned Here](http://daringfireball.net/projects/markdown/syntax).  But to no avail.

I too would like to be able to link to other .md files.  I see the workflow as being similar to Tomboy Notes' Wiki-Style note taking.
Hello,

Great app you have created.  Unfortunatelly I used it once and now can not open it again.  I'm sure you already know this, but just in case here is one url and here is another that relate to the same issue.

I have archlinux 3.15.5-2 (i686) installed on a Dell Insprion D6400.