Version 1.1.0 of the Hierarchy extension has been released.
New features:
* Full "breadcrumb" of superior pages in the navigation box.
* Optional subordinate pages in the navigation box.
* Optional embedded subordinate pages list.
* Separating text between the page content and the embedded
subordinate pages list.
* Automatic adjustment of navigation box width.
* German translation.
http://www.mediawiki.org/wiki/Extension:Hierarchy