If author's notes are necessary to understand the fic, I would include them at the top. If they're sidenotes or random bits of trivia related to the fic that people might enjoy reading, I would include them at the end. If they're unrelated (writing thoughts, whatever) and people can read the fic without needing the notes, just make a post on your own journal or somewhere else, and then link to the notes.
no subject
Date: 2010-07-26 11:07 pm (UTC)