Contrary to my earlier post, I
will enter the debate by saying - here's a neat idea on footnotes/endnotes:
http://newkindofbook.com/2011/07/not...dnote-designs/
"they stuff that material into a now-you-see-it, now-you-don’t part of the page canvas. The signal that extra info awaits is the universally recognizable plus sign, which morphs into the minus sign when the note text is onscreen."
But will this work in an epub?