This book is written so well that I haven't even finished it by any means but am already including several features into my own websites.
The author is very pragmatic and gives countless examples that you can try out just with a plain text editor at home. He has a good writing style that makes it sound as though he's sitting next to you at your desk.
It's beautifully laid out, with lots of code boxes clearly marked and the text is not cramped together like some academic books can be. Plenty of white space is the key here.
I just love this book and am so glad I paid what I considered at the time to be a premium - now I know that it was money well spent.