I've been a developer over the paste 13 years so I am, as one said, the main target for cryptichism (from the author's point of view) in this book. But I've got to admit it, he is almost always, right. Never, in my life, i've found such an amount of good advices compiled together. If you want to improve usability this is a good choice.
Congratulations Mr.Jeff Jonhson! You are one of kind.