Well those on 220.127.116.11, after installing patch you may experience issues wiht changing quantities in "/checkout/cart/"
Say, you change quantity from 2 to 5 and click Update Shopping Cart... and NOTHING HAPPENS!
Go to : /app/design/frontend/yourthemepackage/default/template/checkout/cart.phtml
Find this line: getUrl('checkout/cart/updatePost') ?>" method="post"
and, under this line insert the form key:
<?php echo $this->getBlockHtml('formkey'); ?>
Thanks for sharing!