You can always make 2 or 3 versions with different font sizes and switch between them. Though then it might be a bit tricky to find the spot in the book where you left off (you could look up a sequence of words on the last page in adobe reader and remember the page nb. and go to that page nb. on cybook; clumsy I know).
But besides changing the font size, something I do very rarely, you usually don't do any on-the-fly changes to the ebook on cybook, so pdf, although not perfect, is for me personally still a good alternative.
--Edit
It's possible to figure out a conversion coefficient between two font sizes.
E.g. between font size 10 and 11 it's in my case about 1,08 .
So if you left off at page 50 in the ver. with font size 10, then in the version with font size 11 you have to go to page 50*1,08=54.
I know it sounds silly, but it works.
Last edited by Abelturd; 03-16-2009 at 08:18 AM.
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