I'm partial to ReStructuredText (rst) as the markup language for blog entries instead of markdown because you can extend rst with custom directives.

In Lightbulb, I used the rst Pygments CodeBlock directive by Georg Brandl (https://github.com/espeed/lightbulb/blob/master/lightbulb/di...) to incorporate code blocks like in Sphinx:

  .. code: python
   
     >>> from bulbs.neo4jserver import Graph
     >>> g = Graph()

ReStructuredText also allows you to easily add CSS classes to the markup without dropping down into the raw HTML. The rst container directive (http://docutils.sourceforge.net/docs/ref/rst/directives.html...) enables you to add divs so you can allow the content to drive the page layout instead of always being boxed in by the same default template.

See Jason Santa Maria's 12 min talk on this design concept http://vimeo.com/4394152.