I just read this blog post which explains that Markdown support has been added to all Wordpress.com blogs as a feature.
I administer my own WordPress installation and am currently running (as far as I know) the latest version of WordPress, 3.8.X, I believe. Is Markdown support built into WordPress standalone? I'm in the midst of migration so it's not so easy to check.
Will I be able to write, edit, and allow my users to comment using Markdown fairly seamlessly? Being able to compose posts in Markdown will greatly encourage me to start writing more :)