I'm reading an ePub version of a book that I created in Stanza Desktop. Looks great on Stanza for iPhone (I have an iPhone 4) but the margins are crazy on iBooks 1.1! With the same font size on both apps, I only get about 4-5 words per line in iBooks, and twice that in Stanza.
I'm going to have to figure out how to reconvert my ePub books to work in iBooks if I want to use it, it looks like.