When you leave your N9 that will automatically lock N9 screen/device off.
Application is using proximity sensors. AutoLock locks your phone when inside your pocket or bag...
The application is very simple, yet powerful! Also, feel free to contact author at metacuong@gmail.com with bug reports and feature requests

Version: 1.0.1
Open Source : https://gitorious.org/small-system-u...attan/autolock
Compatible: N9/N950
Author: Le Bien Cuong (or Cuong Le)
Source: Tinhte (Vietnamese forum)
Download: http://ubuntuone.com/3bVrQoQXfs0Gbk8alsZr6v