To deliver your own fonts for eBooks on the iPad or other iOS devices you will need to include the following in an extra file called com.apple.ibooks.display-options.xml inside the META-INF folder:
Been very busy getting 11 chapters for eBook Typography. Now decided to make this subtitled For Flowable, since there is such a great difference between flowable and fixed-layout.
The book started out as a sandbox to try out various techniques, but I have now decided to publish. Target publication date: September August 2012.
In this technical note about a recent eBook that I created, I wrote about the need to include a hyperlink (back to the page where you came from), on the target page. It seems that this is no longer necessary with an ePUB inside the iBooks app on the iPad/iPhone.
Why? Because in version 1.2 of iBooks, it seems that a history of the navigation pathway is kept while the eBook is open. This is then utilised to display (at the bottom of the page) a 'back to page x' hyperlink, when the navigation items are showing*.