James Bridle had an interesting reaction to the revelation that his iPhone was tracking his location: he made a book!
He describes his reaction to his phone’s data collection habits rather poetically:
I love its hunger for new places, the inquisitive sensor blooming in new areas of the city, the way it stripes the streets of Sydney and Udaipur; new to me, new to the machine. It is opening its eyes and looking around, walking the streets beside me with the same surprise.
His book is documented on his site and on flickr.