In 2010, I purchased my first Kindle and since then apart from GEB , I haven’t bothered with physical copies. The Kindle store satisfies most of my needs (I find situations where the paperback costs less than the digital copy and refuse to buy the book on principle).
The books can be read on any platform (OS X, iOS for iPad and iPhone in my case and I do remember a rather unpleasant Kindle app on WP7)
One of the benefits of a digital book is that it should be straightforward for me to collect a list of highlights I’ve made about the book. Amazon (in their infinite wisdom) have not provided an API in the 3 or so years I’ve used the Kindle ecosystem and manually transcribing the quotes is not something I am interested in doing. Scraping remains the only alternative. I decided to use clojure for this task.