If you know Markdown, use that. If you know ReST, use that. If you know LaTeX, use that. Use whatever you’re comfortable with. Trying to figure out a new markup just to write is going to add another layer on top of it. Remember, small changes. This month is all about the change of building a habit of writing every day.
Me personally: I’m using Sphinx and ReST for the text. I know the tools (they’re my default for project documentation) and it’s dead simple.
-T
