diff -urp revisioning/revisioning_api.inc revisioning-NEW/revisioning_api.inc
--- revisioning/revisioning_api.inc	2010-01-27 20:09:32.000000000 -0500
+++ revisioning-NEW/revisioning_api.inc	2010-03-17 15:51:53.000000000 -0400
@@ -312,6 +312,32 @@ function _revisioning_publish_latest_rev
 }
 
 /**
+ * Find the most recent pending revision and unpublish node.
+ * Note that no check is made as to whether the initiating user has permission
+ * to publish this node.
+ *
+ * @param $node
+ *   The node object whose latest pending revision is to be published
+ * @return
+ *   TRUE if operation was successful, FALSE if there is no pending revision to
+ *   publish
+ */
+function _revisioning_unpublish_latest_revision(&$node) {
+  // Get latest pending revision or take the current provided it's UNpublished
+  $latest_pending = revisioning_get_latest_revision_id($node->nid);
+  if (!$latest_pending) {
+    if (!$node->status && $node->is_current) {
+      $latest_pending = $node;
+    }
+  }
+  if ($latest_pending) {
+    _revisioning_unpublish_revision($node->nid, $latest_pending->vid);
+    return TRUE;
+  }
+  return FALSE;
+}
+
+/**
  * Return a count of the number of revisions newer than the supplied vid.
  *
  * @param $vid
diff -urp revisioning/revisioning_triggers_actions.inc revisioning-NEW/revisioning_triggers_actions.inc
--- revisioning/revisioning_triggers_actions.inc	2009-11-19 18:12:29.000000000 -0500
+++ revisioning-NEW/revisioning_triggers_actions.inc	2010-03-17 15:51:53.000000000 -0400
@@ -25,7 +25,7 @@ function revisioning_hook_info() {
         'unpublish' => array(
           'runs when' => t('When unpublishing the current revision'),
         ),
-      ),
+        ),
     ),
   );
 }
@@ -89,8 +89,16 @@ function revisioning_action_info() {
    // Don't need 'changes_node_property'; it will generate a superfluous "save
    // post" action; we're alreay making sure db is updated
    // 'behavior' => array('changes_node_property')
-    )
-  );
+      ),
+    'revisioning_unpublish_revision_action' => array(
+      'type' => 'node',
+      'description' => t('Unpublish revision'),
+      'configurable' => FALSE,
+      'hooks' => array(
+        'nodeapi' => array('presave'),
+      ),
+      )
+      );
 }
 
 /**
@@ -108,3 +116,19 @@ function revisioning_publish_latest_revi
     drupal_set_message(t('"!title" has no pending revision to be published.', array('!title' => $node->title)), 'warning');
   }
 }
+
+/**
+ * Implementation of unpublish_latest_revision action
+ */
+function revisioning_unpublish_revision_action(&$node, $context = array()) {
+  $type = node_get_types('name', $node->type);
+  watchdog('revisioning',
+    'Executing unpublish_revision action for @type %title', array('@type' => $type, '%title' => $node->title),
+    WATCHDOG_NOTICE, l(t('view'), "node/$node->nid"));
+  if (_revisioning_unpublish_latest_revision($node)) {
+    drupal_set_message(t('Revision has been unpublished.'));
+  }
+  else {
+    drupal_set_message(t('"!title" has no revision published.', array('!title' => $node->title)), 'warning');
+  }
+}