I agree w/GlennR, and add that in the unlikely event they don't just cancel your prior unshipped order and replace it with the $.01 shipping.
Don't forget to check the current price of whatever you've ordered. Due to Amazon's ridiculous price volitility in certain areas (tools being one of the most obvious) everytime they've taken a while to ship an order to me I've wound up with a better price. Whenever the price drops just email 'em and tell 'em you want the new price. You'll most likely have confirmation in a few hours of the price change.