I know where you've been

I've been meaning to write an article on methods of tracking people in public spaces using every day devices. I finally got around to writing a blurb on how easy it is to track peoples whereabouts using wifi and bluetooth - even if you never connect to a network. So here it is: Tracking people via WiFi The same techniques are already in use in many places - and target bluetooth as well as WiFi. Comments are welcome on the article.