Originally Posted by DSpider
ePub 3.0 promises real footnotes, at the bottom of the page (with HTML5), except that they won't work on the vast majority of e-readers that have already been sold...
There was a study that showed that 8 or 9 (out of 10) people do not bother with endnotes when reading a book, but almost all will read them if they're on the same page.
Actually when I read the ePub 3 spec they were advocating using the title ability to enter a foot note and expected readering devices would likely use pop up windows to display the footnote. I think that is likely better than the bottom of the page/screen.