Connected Door Bell

It would be nice to reinvent the door bell, the internet of things way. What if we can get the notification on all of the connected devices when someone else rings a door bell? This simple thing can be done with Raspberry Pi with apps for both iOS and Android. What if we put a little web cam to the raspberry Pi and snaps the photo of a person when the bell is rung. The photo will be sent to all the devices. You can talk to your phone and you can listen to what the visitor is saying from your phone.