"...Right now the Greenpeace UK team is using a custom ColdFusion CMS and it no longer meets their needs...
" --rob purdie ( http://groups.drupal.org/?q=node/29 )
Apparently, this is not a shift away from planet2, just a local implementation decision.
Apparently Greenpeace UK still thinks Drupal is better for them even though all the other offices use OpenACS. Better keep the eyes open they consider Drupal better.