With this script you can access your private marks in news aggregators which support Basic HTTP authentication (tested with FeedDemon?).

<?php

if ( !isset($_SERVER['PHP_AUTH_USER']) ) {
   
   header('WWW-Authenticate: Basic realm="My Realm"');
   header('HTTP/1.0 401 Unauthorized');
   echo 'Unauthorized';
   die();

} else {

   // header('Content-type: application/atom+xml');
   header('Content-type: text/xml');

   $Username = $_SERVER['PHP_AUTH_USER'];
   $Password = $_SERVER['PHP_AUTH_PW'];

   $Nonce = rand( 1 , 100000000000000 );
   $CreationTimestamp = date('Y-m-d\Th:i:s\Z');

   $PasswordHash = md5( $Password );

   $PasswordDigest = base64_encode( sha1( $Nonce . $CreationTimestamp . $PasswordHash  ) );

   require_once "HTTP/Request.php";

   $req =& new HTTP_Request('http://api.blogmarks.net/marks?private=true&author=' . $Username . '&last=30');
   $req->setMethod(HTTP_REQUEST_METHOD_GET);
   $req->addHeader('Accept', 'application/atom+xml');
   $req->addHeader('X-WSSE', 'UsernameToken Username="' . $Username . '", PasswordDigest="' . $PasswordDigest . '", Nonce="' . $Nonce . '", Created="' . $CreationTimestamp . '"');

   $response = $req->sendRequest();

   if (PEAR::isError($response)) {
      echo $response->getMessage();
   } else {
      echo $req->getResponseBody();
   }

}

?>