Zuli is a smart plug that converts any electric appliance into smart one. It tracks your presence in the home and turns devices on only when it is required. It creates a bridge between electric socket and devices and then pairs with your smartphone via Bluetooth. When you get close to connected devices it automatically turns them on. You can turn on/off and dim the lights from your iPhone. It works with all appliances, lights and nest thermostat as well.
Additionally Zuli SmartPlug ($53) keeps the record of electricity usage in your smartphone so you always get to know how much electricity your appliances are consuming.
Available at amazon.com for $53