Also, did you read the article:
"They took the text version, stripped off the headers and footer containing the license, re-wrapped the sentences, and made the chapter titles bold,"
That does not exactly sound like strenuous editing and curation.
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[1] http://www.gutenberg.org/wiki/Gutenberg:The_Project_Gutenber...Edit: By the way, as the very existence of this license demonstrates, the digitization carried out by PG of public-domain works does not result in public-domain texts.
'A Project Gutenberg ebook is made out of two parts: the public domain book and the non public domain Project Gutenberg trademark and license. If you strip the Project Gutenberg license and all references to Project Gutenberg from the ebook, you are left with a public domain ebook. You can do anything you want with that. '
Edit: As an aside, PG could copyright their digitization of public-domain works, right?
That way someone can decide if they wish to pay the price for the value add that amazon is providing (presumably convenience) or just go with the free copy.
Without this kind of attribution, many would believe they are either paying for amazons work to format the book or even the book itself (not sure they acknowledge when a work is out of copyright?)