The current iBooks (as of December 2012), can email highlightings and notes we have created while reading an ebook. That's a pretty good way to keep a copy of what we summarized in a book, just in case somehow the ebook data become corrupted in the future.
But is there an order or way to order the highlightings and notes? They seem to be neither by created date or by the order they appear in the book. For example, I added some highlights yesterday in Chapter 3, 4, 5 of a book, and today I added some more highlightings today in Chapter 1 of the same book, and when I email the highlights to myself, some notes from yesterday appear first, and then the highlightings of today (in Chapter 1), and then some more highlightings in Chapter 4, 5.
So there seems to be no particular order? Is there a way to make them in a particular order? Two useful ways may be (1) by the order how the content appears in the book (2) or, by the date and time we added the highlightings.