If you've ever wanted a way to monitor your doorbell from anywhere — complete with video and audio — Instructables user macgeek shows off how to build a system that monitors your doorbell, then kicks the video of the person at the door onto your iPhone.
The project uses FaceTime to send video over the network, through a Mac, and then to the iPhone. You will also need an Arduino, FaceTime compatible webcam, a USB hub, audio converter, speaker and a microphone.
It's an expensive project, but chances are you have most of the required items somewhere around the house already. It can also monitor your front door over the cloud, so if you are away from home and you don't want to miss that courier delivery, you can still tell the delivery company to hide it away somewhere. Head over to Instructables for the full guide.
Home 9000 - The ULTIMATE Doorbell [Instructables]