Just re-compiled the book (in both landscape and portrait orientations). A fair number of 'fixed typos', and a few other minor changes. Some year I'll actually take a crack at 'updating and enhancing' the index (which at present is fairly rudimentary, IMO).
You can grab the book (or individual chapters, which are always the most current), at
http://www.phidot.org/software/mark/docs/book/
p.s. reminder I always welcome pointers to errors, typographical or otherwise.