By David Kudler on The Book Designer:
A question I get asked often is about the difference between different formats of ebooks.
Well, we’ve talked extensively about the difference between mobi (Kindle ebooks) and ePub (everyone else).
But what about the other major format labels that are bandied about? Specifically, what’s the difference between ePub2 and ePub3, and should I care?
We won’t get too geeky here, but we should be able to clear up those distinctions pretty easily.