I have Feeds Alpha 6 Version 2.0 for Drupal 7. I have enabled the Feeds main module and the UI and Feeds News modules. I created a Feeds node and saved the node. Drupal imported the feed and created 30 nodes. I then deleted all the Feed Item nodes. I then tried to reimport all those nodes by deleting the Feeds node and re-creating it. Drupal reports that there are no new nodes. Drupal seems to remember somehow that the Feed Item once existed and refused to re-import that item.