It's late, you're hammered. And you've lost your house keys? Still got your phone somehow but looks like yet another drunken camping night on the front stoop. With the Lockitron, you could have at least passed out in the foyer.
The Lockitron system by Apigy combines an electric deadbolt with a plug server connected via an Ethernet cable. You use your smartphone to communicate with the server controlling the lock over the web (the data is encrypted and avoids potentially dangerous Wi-Fi systems) to open or close the bolt. The Lockitron also has an available NFC option for select phones and accepts physical keys in the event of an emergency. Another interesting feature is the ability to make digital "keys" and send them via email to friends, relatives, or drunken exes.