You can read Jordan Mechner's journal from the time that he was developing the original Prince of Persia. It's one of the most fascinating devlogs/creation sagas I'e ever read: http://jordanmechner.com/old-journals/page/11/
That together with Andrew Braybrook's journals on the development of Paradroid are among my most favorite developer stories from the golden age of computer games. Does anyone know if there are more reports like that available online?