oh no worries, i know helping people is voluntary anyway. i'd love to do it more often, that's one of the reasons i'm trying to learn more.
you should be familiar enough with that book, you're thanked and mentioned on page xviii. if the book was copylefted, i would buy two. almost no one is going to sell a copylefted book though, except richard stallman: "Permission is granted to make and distribute verbatim copies of this book provided the copyright notice and this permission notice are preserved on all copies." ($25.00)