Also, I should add, that this project is actually better than the WMD version of StackOverflows Markdown for the pure reason (as I've already identified), you can have multiple textareas on the same page which support the Markdown editor. (I struggled and gave up trying to get the SO editor to do that, it just wasn't possible from the current version).
BTW: Google won't let me (my IP being from Iran) to access that repository, so maybe someone can make a clone of it on Github.