Are you willing to give the power company basically unlimited access to your electronics in an effort to conserve energy?  If California has its way, you won't have a choice.  From World Net Daily via Engadget: 

The government is seeking to limit rolling blackouts and free up electric and natural gas resources by mandating that every new heating and cooling system include a "non-removable" FM receiver. The thermostat is also capable of controlling other appliances in the house, such as electric water heaters, refrigerators, pool pumps, computers and lights in response to signals from utility companies. If contractors and residents refuse to comply with the mandate, their building permits will be denied.

The proposal, set to be considered by the commission Jan. 30, requires each thermostat to be equipped with a radio communication device to send "price signals" and automatically adjust temperature up or down 4 degrees for cooling and heating, as California's public and private utility organizations deem necessary.

Now, saving the environment is all well and good, but the last person I want making the decisions for the temperature of my house is someone who doesn't have to live in said house.  Especially when they talk about controlling the supply of power to important thing like refridgerators, water heaters, and my computer.  At my house, we do have a shut-off box that the utility company can control on hot summer days, but it's only for the central air, not anything else, and it gets us a break on the utility bill. 

That's fine; intruding into my home is not cool.  Or hot.  Whatever the weather's like.