Quim Gil Hoernecke mentions in one of his blogs that  after a lot of discussion and reviewing,  Plone seemed to be the most appropriate CMS for the revamped www.gnome.org here and now.

The reasons for choosing Plone rely more on people than code, since both tools (The second option in this tight final was Midgard, the CMS powered with GNOME libraries) could reach all the requirements with hacking and good will.

Three other candidates were dismissed previously and we needed very good arguments to do so. The localization recommendations made by the GNOME i18n team were crucial in the selection. See why not TikiWiki and why not eZ Publish or Drupal. Something learned in detail during this process is that apparently simple tools can match your requirements if you have the knowledge and the resources to do so. At the end this is a reason why we love free software so much.