Joshua,
I bought this book when it first came out and find it very useful.
When pushing a new version, are you putting a version number or update date somewhere easy to find it? There has been a lot of controversy about whether Amazon is really letting users download updated versions of books, and a "last updated" date on the title page would be one way to know for sure.
(Also, thank you for allowing the book to be open in Mobipocket Reader on the desktop. That is one of its most useful features.)
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