This treasure shows a short video clip of sending a Twitter using Arduino board and Ethernet Shield.
With this shield you can monitor through HTTP the status of the fire/burglar/cooling system and environemental information. The shield can be connected to an Arduino Ethernet with POE you then have a nice little and universal sensor you can plug into your network and use to retreive information for your alerting system like nagios.
Similikiti Project is Smart home project. The device from Similikiti project evaluates the data such as power consumption, humidity, temperature and illumination intensity at home. User can monitor these data through Twitter conveniently.