article "Your E-Book Is Reading You"
As a reader I am less than thrilled with the idea of being tracked in such a way. Smacks too much of a Orwellian type deal for me. Whether or not Amazon's tracking stuff works for the "Kindle for PC" deal is not made clear.
I also know that I fundamentally read much differently on screen than with a book in my hands. I read slower, for shorter stretches of time, and have less patience with an on screen book than I do with a print book.
The world is changing and while this may help some authors in some way, one should be able to read what one wants to with an expectation of privacy.