Here are the sites linked in this essay.
[The Elements of User Experience]
http://www.amazon.co.uk/Elements-User-Experience-User-Centered-Design/dp/0321683684
[The Nature and Art of Workmanship]
http://www.amazon.com/The-Nature-Art-Workmanship-David/dp/0713689315
[Josef Müller-Brockmann's]
http://www.amazon.co.uk/Grid-Systems-Graphic-Design-Typographers/dp/3721201450
[developer documentation or tools]
http://www.baldurbjarnason.com/notes/treat-ebook-developers-as-developers/
[my earlier theme]
http://www.baldurbjarnason.com/notes/treat-ebook-developers-as-developers/#addendum
[poor documentation and no tools]
http://www.baldurbjarnason.com/notes/treat-ebook-developers-as-developers/