Retrieve attributes by groupId

Problem: how to retrieve product attributes by group id.
See here: http://www.magentocommerce.com/boards/viewthread/79694/

Possible solution:

<?php
require_once 'path/to/app_dir/app/Mage.php';
Mage::app('default');
$product = Mage::getModel('catalog/product');
$product->setAttributeSetId('THE ATTRIBUTE SET YOU WANT TO USE');
$groupId = 'THE ID OF THE GROUP YOU WANT TO RETRIEVE';

$collection = $product->getAttributes($groupId, false);
foreach($collection as $attribute){
//do something with the attribute
}
?>