Add Links to WordPress 3.3 New Toolbar

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<?php

add_action('admin_bar_menu', 'add_toolbar_items', 100);
function add_toolbar_items($admin_bar){
	$admin_bar->add_menu( array(
		'id'    => 'my-item',
		'title' => 'My Item',
		'href'  => '#',
		'meta'  => array(
			'title' => __('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'
		),
	));
	$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'
		),
	));
}

?>

Instructions:

Just put this snippet in the functions.php file of you theme. And note that the second and third of $admin_bar->add_menu are add sub menu to the first, and the parent parameter is set to the id of the first $admin_bar->add_menu, which in this case is my-item.