[charleski]

IGP deserves a mention (or actually it might be people at Canongate, whoever did Pereira Maintains, anyway).

They have the typographical savvy to specify vertical margins in increments of the line-height, which earns them a lot of brownie points, and I was impressed by their use of JavaScript to inject the span tags needed to make iBooks work properly, rather than littering them in the text to burden other readers.

Originally Posted by virtual_ink

There are a few basic standards that EPUBs should meet, outlined clearly here: http://www.publishinginnovationawards.com/the-qed

Wow, that list is so basic it's a joke:
"3. Order of content: check of the content to be sure that none of it is missing or rearranged." - yes, it would be nice if the ePub didn't have any missing chapters.
"12. Symbols: Text does not contain odd characters." - yes, it would be nice if your readers could actually read your book.
"13. Metadata: Basic metadata for the title (author, title, etc.) is in place and accurate." - yes, it would be nice if people could actually find out what book this is.