--- FeedsParser.inc	2011-02-22 16:59:10.000000000 +0100
+++ FeedsParser-new.inc	2011-02-24 10:49:03.000000000 +0100
@@ -100,6 +100,10 @@ abstract class FeedsParser extends Feeds
       'name' => t('Feed node: User ID'),
       'description' => t('The feed node author uid.'),
     );
+    $sources['parent:nid'] = array(
+      'name' => t('Feed node: Node ID'),
+      'description' => t('The feed node nid.'),
+    );
     return $sources;
   }
 
@@ -130,6 +134,10 @@ abstract class FeedsParser extends Feeds
         ($node = node_load($source->feed_nid))) {
       return $node->uid;
     }
+    if ($element_key == 'parent:nid' &&
+        $source->feed_nid) {
+      return $source->feed_nid;
+    }
     $item = $result->currentItem();
     return isset($item[$element_key]) ? $item[$element_key] : '';
   }