I'm really unlucky up to now, almost all the pdf tried on the nook reflows badly. I would really like to be able to rotate the screen and suppress margin but currently that's not usable as it is for me
The docs aren't scanned images, for exemple I tried today the Semantic MediaWiki documentation
here, it reflows some page in medium font size but not all of them. It seems the pdf reader embedded needs a lot of improvement, let's wait the next firmware then ...