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// In our custom module 'mymodule' let's go ahead and implement hook_form_alter() (what else!?) and switch on $form_id.
function mymodule_form_alter(&$form, &$form_state, $form_id) {
  switch ($form_id) {
 
    // This is the general term form.
    case 'taxonomy_form_term':
 
      // Checking if we are on the delete confirmation form.
      if (isset($form['delete'])) {
 
        // Getting the term id.
        $tid = $form['#term']->tid;
 
        // Limiting the query to 30 to save resources when loading the nodes later on.
        $limit = 30;
 
        // Getting node ids referencing this term and setting a limit.
        $result = taxonomy_select_nodes($tid, FALSE, $limit);
 
        if (count($result) > 0) {
          $markup = t('This term is being used in nodes and cannot be deleted. Please remove this taxonomy term from the following nodes first:') . '<ul>';
 
          // Looping through the node ids, loading nodes to get their names and urls.
          foreach($result as $nid) {
            $node = node_load($nid); // This is quite resource hungry, so if dealing with loads of nodes, make sure you apply a limit in taxonomy_select_nodes().
            if (!$node)
              continue;
            $markup .= '<li>' . l($node->title, 'node/' . $node->nid, array('attributes' => array('target'=>'_blank'))) . '</li>';
          }
 
          // Appending some text with ellipsis at the end of list in case there might be more nodes referencing this term than the ones displayed.
          if (count($result) >= $limit)
            $markup .= '<li>' . t("... only the first @limit results are displayed.", array('@limit' => $limit)) . '</li>';
          $markup .= '</ul>';
 
          // Using the render array's markup key to display our warning message.
          $form['description']['#markup'] = $markup;
 
          // Removing the 'delete' button from the form.
          $form['actions']['submit']['#access'] = FALSE;
          // $form['actions']['submit']['#disabled'] = TRUE; // Disables the button instead of removing it.
        }
      }
      break;
  }
}