Are you ready to trust your safety to an iPhone-controlled lock? Lokitron launches such a thing. It is to appear in March, but is available for the pre-order right now. It is controlled through SMS or Internet, thus available to operate even from another country. It is said to inform you when someone is knocking on your door, so you won't miss any guests.
I'm not ready to switch to this technology until it is proven to be safe, and you?