Only in cdn/: .DS_Store
diff -up cdn.current/cdn.admin.inc cdn/cdn.admin.inc
--- cdn.current/cdn.admin.inc	2010-10-21 15:45:33.000000000 +0100
+++ cdn/cdn.admin.inc	2010-11-23 13:47:57.000000000 +0000
@@ -239,6 +239,21 @@ function cdn_admin_other_settings_form(&
     '#process'       => array('ctools_dependent_process'),
   );
 
+  $form['versioned_objects'] = array(
+    '#type' => 'fieldset',
+    '#title' => t('Versioned Objects'),
+    '#description' => t('Allows for objects to be versioned, thus allowing more consistent cache invalidation with new deployments'),
+  );
+  $form['versioned_objects'][CDN_VERSIONED_OBJECTS_VARIABLE] = array(
+    '#type' => 'checkbox',
+    '#title' => t('Enable versioned objects'),
+    '#description' => t(
+      'Objects are verioned to allow for better cache object invalidation - requires .htaccess patch'
+    ),
+    '#default_value' => variable_get(CDN_VERSIONED_OBJECTS_VARIABLE, CDN_DISABLED),
+    '#process'       => array('ctools_dependent_process'),
+  );
+
   $path_explanation = t(
     "Enter one file pattern per line. The '*' character is a wildcard.<br />
     Example file patterns are <code>*.js</code> for all JavaScript files and
diff -up cdn.current/cdn.module cdn/cdn.module
--- cdn.current/cdn.module	2010-10-29 13:19:09.000000000 +0100
+++ cdn/cdn.module	2010-11-23 13:48:40.000000000 +0000
@@ -21,6 +21,7 @@ define('CDN_MODE_VARIABLE', 'cdn_mode');
 define('CDN_MODE_BASIC', 'basic');
 define('CDN_MODE_ADVANCED', 'advanced');
 define('CDN_STATUS_VARIABLE', 'cdn_status');
+define('CDN_VERSIONED_OBJECTS_VARIABLE', 'cdn_versioned_objects');
 define('CDN_STATS_VARIABLE', 'cdn_stats');
 define('CDN_DRUPAL_ROOT_VARIABLE', 'cdn_drupal_root');
 define('CDN_HTTPS_SUPPORT_VARIABLE', 'cdn_https_support');
@@ -106,6 +107,10 @@ function cdn_file_url_alter(&$path) {
       cdn_load_include('stats');
       $start = microtime();
     }
+    
+    if($versioned_objects){
+      $path = 'cdn/'.filemtime($path).'/'.$path;
+    }
 
     // Load the include file that contains the logic for the mode that's
     // currently enabled.
Common subdirectories: cdn.current/patches and cdn/patches