It has been mentioned that the iBook will use the popular ePUB format for it's eBooks. I went online and found a free website providing ePUB books and for example Moby Dick was around 688KB for a 550ish page book. Would it be safe to assume this is going to be the same size we could expect from Apple or are they going to add their own twist into the book format causing an increase in size? The main reason I am asking is to size out an iPad for my Girlfriend. She honestly may have a few tv shows/movies on the device but I suspect more iBooks than anything else.