<?php
/**
 * Add Links to WP3.3+ New Toolbar
 *
 */
add_action('admin_bar_menu', 'add_toolbar_items', 100);
function add_toolbar_items($admin_bar) {
  // Top level menu
  $admin_bar->add_menu( array(
                'id'    => 'my-item',
		'title' => 'My Item',
		'href'  => '#',
		'meta'  => array(
			'title' => __('My Item'),			
		),
  ));

  // Add sub menu to my-item
  $admin_bar->add_menu( array(
		'id'    => 'my-sub-item',
		'parent' => 'my-item',
		'title' => 'My Sub Menu Item',
		'href'  => '#',
		'meta'  => array(
			'title' => __('My Sub Menu Item'),
			'target' => '_blank',
			'class' => 'my_menu_item_class'
		),
  ));

  // Another sub menu to my-item
  $admin_bar->add_menu( array(
		'id'    => 'my-second-sub-item',
		'parent' => 'my-item',
		'title' => 'My Second Sub Menu Item',
		'href'  => '#',
		'meta'  => array(
			'title' => __('My Second Sub Menu Item'),
			'target' => '_blank',
			'class' => 'my_menu_item_class'
		),
  ));
}

?>