just discovered in the porridge dripping from a willow tree:

RedCloth 2.0.11.
http://rubyforge.org/frs/download.php/698/redcloth-2.0.11.tar.gz

RedCloth[1] is a module for using Textile in Ruby. Textile is a text 
format.  A very simple text format.  Another stab at making readable 
text that can be converted to HTML.

I recently noticed that aliased links were busted.  But they're fine 
now.  Aliased links allow you to provide a nickname for URLs in your 
document.  For example, the textile reference is given an alias of 'ref' 
at the end of this message.  Link it like this: "A Textile Reference":ref.

Also, div tags go untouched now.  The references are now generating as 
valid XHTML.  More patches and bug reports from my faithful associates 
Mr. D. Mertz and Mr. F. Ros.  The hyphen problem is diminished.  I thank 
everyone.

Oh, and Ri documentation is auto-installed.  RDoc now at 
http://redcloth.rubyforge.org/.

_why

fn1. http://whytheluckystiff.net/ruby/redcloth/
[ref]http://hobix.com/textile/