No talk of Windows alternatives here, and since I just setup a Win machine yesterday, I found Markdown Pad 2 [1]. There's both free and paid version. It seems to get the job done for me for now. I am a Mou user on Mac.

Just installed this, will check it out, especially the git-hub jekyll pages stuff...

[1] http://markdownpad.com/news/2013/introducing- markdownpad-2/