Phillips Hue
Phillips Hue is a network-enabled lighting system for your home. You swap all the bulbs in your home with Hue LED bulbs and configure the Hue bridge as a control hub for all of the bulbs in your home, giving you a completely personalized colored lighting depending on any factor you choose. You can change your lighting's color to red to match the creepy horror movie in the middle of the movie while your partner has a blue light in the bathroom to enable them to enjoy a nice relaxing bath.
The developer APIs allow you to trigger bulb configurations via HTTP posts, which means that you can automate almost any lighting situation you like using web hooks. You can trigger flashing red lights when there's breaking news on your favorite news channel or light the living room blue when you're mentioned on Twitter.
Find out more about the Hue API at the developer website at http://bit.ly/dev-hue.