In many cases, the mechanics for the gizmos already exist — mainly wireless sensors, cellphones, broadband access and home computers. What’s been missing, and what researchers now are trying to develop, are ways to harness the hardware to run your entire house with little effort or technological savvy — letting you turn up the heat remotely, anticipating when you want the lights on, or deciding automatically how long your food should cook. [WSJ via E M E R G I C . o r g]