Markdown is available for self-hosted WordPress through Jetpack
Jay! I’ve just noticed that. It’s funny when searching for Markdown on WordPress return this article:
Write (More) Effortlessly With Markdown
Basically, they mentioned that Markdown is only available for WordPress.com blog, by a simple switch in configuration. I am skeptical, so I always try to use “official” version of plugins. Yes, there are many Markdown plugins out there
http://wordpress.org/plugins/tags/markdown
When I check my Jetpack version, it’s already there! So if you want to write in Markdown style (like Github and StackOverflow), just enable it (why not?).