Oh, I meant also to say (though you might already be aware of this in which case apologies for repeating stuff you already know!) that although the Kindle doesn't use the NCX file to create a TOC for the user, it's still something you should include in Kindle ebooks, since the Kindle uses the NCX file to enable "skip to previous/next navigation point" navigation using the 5-way control button, and the navigation points defined in the NCX file are marked on the progress bar - both features that those users who are aware of them do generally appreciate.
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