module.module

<?php

function MODULE_form_alter(&$form, $form_state, $form_id) {
  if (!empty($form['#node'] && !empty($form['#node_edit_form'])) {
    $node = $form['#node'];
    $action = in_array('add', args()) ? t('Create new') : t('Edit existing');
    switch ($node->type) {
      case 'article': drupal_set_title(t('!action basic article', array('!action' => $action))); break;
      case 'blog': drupal_set_title(t('!action blog article', array('!action' => $action))); break;
      case 'audio': drupal_set_title(t('!action audio conent', array('!action' => $action))); break;
      case 'whitepaper': drupal_set_title(t('!action white-paper', array('!action' => $action))); break;
      case 'video': drupal_set_title(t('!action video content', array('!action' => $action))); break;
    }
  }
}