gistfile1.php

<?php

if (arg(0) == 'user') {
    switch (arg(1)) {
      case 'register':
        drupal_set_title(t('New Accounts'));
        break;
      case 'password':
        drupal_set_title(t('Retrieve Password'));
        break;
      case '':
      case 'login':
        drupal_set_title(t('User login'));
        break;
    }
  }