Meet the Sesame: a smart door lock that lets you open or close your door using your smartphone. It fits on most locks quickly and does not require you to be a genius to install it. You can share access with others and find out whenever your door is opens or closes. The battery life lasts for about 500 days. You get a notification when the battery is running low.
Sesame has an optional WiFi Access Point that connects it to the Internet. You can set up a custom knock, talk to your phone to open your door, or just use your old keys when you need to. Yet another interesting Kickstarter project.