Originally Posted by Namekuseijin
isn't iBooks format basically ePub?
isn't Mobi Amazon ebooks DRM'd and only readable on a kindle reader? (though I stripped the DRM and had been reading them on my e-ink reader too, haha amazon sue me)
Amazon has apps that allow people to read their book on iOS, Android, Windows, OS X, Blackberry, etc. Apple does not. iBooks as far as I know has DRM that has not been broken and only allows the books to be read on an iOS device. I can't even read them on my Mac computers.