Turning Twitter into a universal switch

After you get the Arduino talking nicely with Twitter, turning it into a switch is cake. I used a power switch tail which is a pretty cool device in itself. It's basically an extension cord with a built in switch, and when a 5V dc current is supplied, the switch is on, otherwise it is off. This is perfect for the arduino because it's just a high or low pin setting to turn on or off the power. Combined with the twitter control or the arduino, it essentially turns twitter into a universal switch for any household appliance. You could also hook it up to a power strip to turn on or off a bunch of devices, for example turn on or off all the lights in your room.