Render markdown as HTML in Ember via `registerBoundHelper`. This example uses https://github.com/evilstreak/markdown-js.

ember_handlebars_markdown_helper.js

  Ember.Handlebars.registerBoundHelper('markdown', function (content) {
        return new Handlebars.SafeString(markdown.toHTML(content));
  });

markdown.handlebars

My markdown as HTML looks like:

{{markdown myObject.markdownFormattedContent}}