Reading the thread, perhaps you still don't have an answer. I see you are using InDesign CS 5.5. One method is to create lots of mini documents within InDesign, IE break your Document up into logical smaller documents. Then you create a book in InDesign and all your smaller documents then are added to the book. I can guarantee you that when InDesign exports the book to ePub, each document will start on its own page. If you try this method, you can't use the File -> Export method. Instead on the Books window in the top right hand corner, you select the down arrow and from the drop down list select export to ePub from there. This had me stumped for a few minutes a couple of weeks ago.
I'm not sure why people say you iBooks on the iPad and iPhone wont recognise page breaks from the CSS. I've done it, I do it every day and it works, I promise you. Here is a sample of my CSS and note the last line.
p.Header {
font-family : "Qlassik Bold", sans-serif;
font-weight : bold;
font-style : normal;
font-size : 2em;
text-decoration : none;
font-variant : normal;
line-height : 1.2;
text-align : left;
color : #d90000;
text-indent : 0px;
margin : 0 0 4em 0;
page-break-before: always;
}
So everything tagged in the XHTML as a header ie: <p class="Header">Logbook 463</p> has a page break before it.
I've attached some images to show that it works. Also an image showing the menu you use from InDesign to export a Book to ePub.
I'm happy to send you some of my XHTML and CSS if it will help?