John Holbo points out something interesting:
I can’t footnote [to] a Kindle edition. No pages. What will the world come to? Bibliography has gotten a bit old and odd in the head in the age of the internet, but the [absence] of pages themselves is kind of a watershed.
Given how badly the editors of the Bluebook screwed up the first rounds of internet citation forms, I can't wait to see what they do with pageless ebooks.