To print the sku in the shopping cart, even for Configurable (it will print the underlying simple product sku).
Place this code somewhere in: app/design/frontend/default/default/template/checkout/cart/item/default.phtml
if (is_object($this->getChildProduct())): echo $this->getChildProduct()->getSku(); else: echo $_item->getSku(); endif;
This will now print the sku… onto more work.
Did this help you out? It took me a few days to piece together all this information together, I hope this saves you some time (who knows, maybe the future me will be thankful I wrote this down). Let me know your thoughts. firstname.lastname@example.org