EtText. Not new, but here to remind me to look at it in depth later.

EtText is a simple plain-text format which allows conversion to and from HTML. Instead of editing HTML directly, it provides an easy-to-edit, easy-to-read and intuitive way to write HTML, based on the plain-text markup conventions we've been using for years.

EtText markup is simple and effective; it's very similar to setext, WikiWikiWeb TextFormattingRules or Zope's StructuredText.