GitHub Markdown Preview
Today I was creating readme file for one of my projects located on GitHub and I found really nice github web page that allows you to see on the fly how will look your readme converted from makrdown notation to html one. You will also see the final result, what really increases speed of creating such markdown readmes. Take a look there if you are using or plan to use this type of readme files.
automate with command-line using http://grosser.it/2009/06/17/quick-markdown-preview-for-github-readme/ 🙂
Currently, when using github as your remote repository you can also edit markdown file directly from github web page where you have preview option (just like it will be displayed on github web page when going to project page).