Update 2011-11-23

Update 2011-11-23: Two people have said a worry is that public location data makes you more vulnerable to theft. My thought is that there are already multiple ways to tell if someone is home: lights, car, watching the door, looking in the window, calling the house phone and seeing if anyone answers. None of these are that reliable, and neither is this one: there might be other people who live in the house as well.