Drupal now supports the Atom syndication format 0.3, a XML-based content and metadata syndication format. Drupal supported Atom 0.2 before, so check Mark Pilgrim's Atom 0.3 announcement to learn what changed. When Drupal's Atom module is enabled, a auto-discovery <link> tag will be added to your pages so aggregators can pick up your feed. To see drupal.org's Atom feed, click here.