So you want to link up your entire house with your iPhone? SmartThings ($150 and up) can help make it happen. This new system promises to let you control and/or receive notifications from a variety of devices — such as power outlets, open/shut, motion, and presence sensors — with many more on the way. Need to know if you shut your front door, turn out a light, or find out if your kitty has gotten out of the bathroom? Fire up the app and you'll be able to do all that and more, from where ever you are.