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Cool. What I'd really love is to be able to go to Amazon (or something) and pay to have a PDF download. I'd even pay retail if it meant I get the PDF now and the physical in the mail (though living in AU I don't think Amazon sell us books physically but you get the idea).

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This system is exactly how pragprog.com works.

You can even purchase a PDF/book combo before the book is completed and have access to a (constantly updated) beta version of the PDF. When the book is completed, the PDF is finalised and the book itself is mailed to you.

Awesome. Can't wait to see this model expand.

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