The first milestone was finishing the book. The second was getting my first kook erratum -- and it was a doozy! And now, the third and final milestone has been reached: the first kook Amazon review. Someone named Kevin in the "Bay Area" thinks all my codeblocks have typoes in them, because supposedly none of them work. I infer that he is running perl 4.0436. Simon Cozens pointed out that I was being rash in assuming he even had perl installed at all.
In other news, there's a new Amazon.com editorial review of the book. Took long enough! Amazon.co.uk had one months ago. Although belated, it's pleasantly positive.