And on another day: What about a version for tracking children? I have to say that I find this somewhat spooky.
I think that already exists–at least for driving and driving + texting [1]. I'm actually okay with it for those uses (I have a teen and 3 smaller kids).
I don't need to know where my teen is at all times but if I can reduce (a) her chances of dying and (b) my car insurance bill, sweet.
[1] http://www.wsoctv.com/news/news/local/aaa-testing-device-tra...
That being said, I would buy a similar/simpler device for my cat–not because I give a damn if my cat how many steps it takes but because I want to know where it goes all day (on a map).