Log Message:
Initial import of WMD, a simple, lightweight HTML editor for blog
comments, forum posts, and basic content management. You can add
WMD to any textarea with one line of code. Add live preview with
one line more. WMD works in nearly all modern browsers, and is now
completely free to use. The next release will be open source under
an MIT-style license.

This is not a WYSIWYG editor. Writing HTML to look a certain way
can make your text less accessible to blind people, search engines,
mobile users, and feed readers. HTML describes a document's logical
structure -- not its appearance. It just wasn't built for WYSIWYG.

So WMD is something new: a Wysiwym Markdown editor.