Okay, if you haven't read it before, Code to Zero by Ken Follett. I love this book.
I just finished re-reading Pillars of the Earth by Ken Follett since the sequel has been released recently. It is a great read centered around cathedral building in the middle ages; the most advanced technology of the time. However, I did read this with the Kindle app, so I guess it is not strictly in keeping with the thread title.
I also read Ender's Game for the first time. A sci-fi classic from the 90's. It was the first book I read on the iPad and loved the irony of the characters pulling out their "desks" and putting them on their lap to read, work or to play games. Prophetic.