I'm currently trying to add a new column to a product order, when you create a new shipment (the adminhtml/blocks/sales/order/shipment/create area) and have been beating my head against for a while, with various different guides. I've tried to change the item.phtml and form.phtml with very little success.
I was able to change the form block itself (form.php), but that's little help with the deeper core of the product listing. I'd like each product to have a column for its manufacturer attribute, but I'd be happy with just a column showing up where it's supposed to.