In the e-book realm, authors must abandon the notion of the “page.” Pages have no meaning in e-book form, because pages become amorphous shape shifting creatures depending on the e-book reader; the reader’s choice of font size, font style or line spacing; or in the case of the iPhone, whether they’re holding it vertically or sideways.
When the notion of page disappears, it creates other problems for traditionally formatted books. The page numbers in your table of contents or index become meaningless. Your artificial page breaks, made via the common bad habit of multiple paragraph returns, create blank pages. Your forced page breaks disappear.
The secret to good e-book formatting is to keep it simple: A paragraph return at the end of a paragraph, a proper indent at the beginning of the paragraph, a couple paragraph returns between each chapter, things like that.
For long form narrative books, which is what most people read, readers buy books for the words, not the formatting. Don’t let your formatting get in the way of the words.
For helpful formatting tips, read the Smashwords Style Guide.