Welcome to MobileRead dreamingreader. Glad to have you here.
The use of PDFs on any device is mainly a function of the size of the screen. Current e-ink devices are in the 6" to 7.x" range and to display an A4 or letter size PDF on that size screen requires that the fonts be scalled down to the point where they look like squiggles (scientific term for "I can't read it.") The Cybook (as announced) will have a 6" screen just like the Sony so that will not help in reading PDFs.
There is the program PDFrasterfarian that many people say makes the PDFs more readable but I have never tried it. Hopefully someone else can comment on it.
Adobe has announced their new Digital Editions reading software that offers reflowable documents; but there are several problems with that in your case. First, while Sony was included in the original announcement as a company that had agreed to incorporate it in their reading device, there was no time frame given as to when this would happen (there is a small pool in another thread as to when this will occur), no assurances from Sony that it will even be part of a future update for the current Reader (it could even be available on a later model only and never available for the current version), and it is not designed to reflow current PDFs.
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