We recently took over maintenance of the Drupal Workflow Post Install module. This module is an add-on for the excellent Workflow module. Our work included extending the module to encompass database cleanup as well as the original purpose of setting Workflow states on existing content, introducing a Drush interface, and fixing a quite a few bugs. It has also been updated for Drupal 7 compatibility, which was long overdue.
Future work will include an user interface as well as allowing greater flexibility in the selection of nodes to update.