Originally Posted by tompe
I think the font size and font family is stored in system/user/config.dat. I looked at this file and it stores the file you should open when turning the Cybook on.
Actually, there's this mobipocket file that when I did a bulk move from the Cybook's internal storage to the SD card, I accidentally moved that file as well - not leaving a copy in the Cybook's \eBooks folder. So I just copied it across to the Cybook's internal memory and, strangest thing, my Font Family and Size settings magically got restored! Lesson there is to NOT remove that file. ;-)