This book is written to address the questions most people ask - From "What were you thinking when you invented it?" through "So what do you think of it now?" to "Where is this all going to take us?", this is the story.
It is not a technical book. (If you want the technical details, check out the W3C web site!). It does mention a little about how technologies you may have heard of - like XML - fit in to the past, present and future, but only in the course of charting the course for the Web from the initial dream - still largely unfulfilled - to the next technical and social revolution.
Now it has been out for a while, it seems different people like different bits.