sorta off topic, but i ordered an iMac last fall, used the the Sign for Delivery form that is found on Apple's site, which i taped to the front door. in return, the Fed Ex driver stuck their Need's Signature slip right next to it and didn't leave the iMac.
There have been reports of this, which is precisely why UPS and FedEx would rather not leave it at the door and make waiver-signers assume ALL liability.