"Pawns are the soul of chess." -Philidor
Well, I've had this book for a few days, and am very, very happy I got it. I devoured the first chapter, which was 84 pages in length and covered mostly the Nimzo Saemisch. I'm well into the IQP chapter now.
Emphasis on pawn structure is something alien to me, since I have primarily played 1.e4 with white, and the Najdorf and KID with Black (though lately I have done all kinds of experimenting with openings for both colors in an effort to understand more types of positions). My large chess library had not a single book on pawns. OK, so some books do have a small chapter on pawns, but nothing special. My general attitude had been that pawns were only good for sacrificing

. I got my first clue that this attitude was incorrect when I watched Kasimdzhanov's DVD on strategy (which I also highly recommend).
Why the big deal about pawns? Pawns are helpful reminders of how play could and should develop. You cannot formulate a plan without taking into consideration those little foot soldiers. This book does an excellent job of explaining clearly the ins and outs of certain pawn structures. Basic questions are answered, like: Where should both sides be playing? Which pieces are problem pieces? Also, more advanced questions are tackled, such as: Do the positions reach a crisis point earlier or later in this opening/structure? Would this fit my style?
Other things I like about this book: it is well made (quality paper),
very well organized, the author clearly spent alot of time and effort into writing it, and he is brutally honest at times. Lots of verbal explanations, and not a deluge of variations.
Now Sokolov does not cover all pawn structures. There are no Grunfelds, Sicilians, or hedgehogs in this book. He does, however, thoroughly cover structures that arise from most classical queen pawn openings. For example: the Tarrasch Defense, the Semi-Tarrasch, the Nimzo Saemisch, the Queen's Gambit Accepted, some QID positions, some QGD positions (like the Tartakower), Ragozin, etc. Often he will give an overview of an entire defense to further give you a feel for resulting positions, as Sokolov did with the Tarrasch Defense. I would suggest if anyone plays 1.d4 or one of the above defenses to it, this book is a must-buy.
Each game has been commented on throughout. He does not stop annotating after the opening stage. In fact, you could probably skip the emphasis on openings and pawn structures and still get lots out of this book. 45 chess lessons from a world class player like Sokolov for so little money is hard to pass up.
I believe this book will greatly reward anyone who puts in the time and work to read it, study it, eat it, and know it inside out. Even if you don't play any of the openings listed above, this book will open your eyes to planning and to the power of the pawn.
Hope this was helpful to anyone thinking about buying it.