First, my programming books, because they are generally very heavy and I like to read them very often. Then I have books like GEB which I still have to read and

First, my programming books, because they are generally very heavy and I like to read them very often. Then I have books like GEB which I still have to read and understand completely. Lastly I have a couple of books which are on other topics such as code breaking, math and similar. Nowadays I read most books on the kindle tough, because it's very expensive to ship from amazon to italy.