“iBooks now fits more words per page by automatically hyphenating text, available only on iOS 4.2 or later.”
Doubtless only possible through the use of private APIs which no competing eReader is allowed to access. I mean, I’ve been investigating this for eight months now and still haven’t found a way to make UIWebView do this without slowing everything down way too much to be useful.
Apple Updates ‘iBooks’ With Illustrated Books, Collections, and AirPrint - Mac Rumors