Hi,

The theme is greenNblack that I probably downloaded from : http://drupal2u.com/2008/03/free-drupal-theme-greennblack/

I'm not using the packaged version of Drupal but the one directly from www.drupal.org.
Looking at Hardy/Intrepid, I only see 5.x in the repository but the name change from "drupal" to "drupal5" let me think that a "drupal6" will probably be available in Intrepid.

Stéphane