[inebriate]

in minicart.php add the code below before "?>"

if (!empty($cart["products"]) and is_array($cart["products"]))
{
	$smarty->assign("last_item_added", end($cart["products"]));
}

and in minicart.tpl use $last_item_added and its associated values, ie: $last_item_added.productid


...however when you add a similar product it will not get updated, it requires a bit more code