I'm a confirmed beginner and I don't want to waste too much time for the moment on learning new openings. I have 1 or 2 solid openings that I play all the time but I lack of ideas after 10 to 15 moves. So I made a selection of 3 books based on their summary and what I think would help me with my middle game:

Dvoretsky - Strategic Play
Vukovic - Art of Attack In Chess
BOROVSKY - The Middle Game in Chess

They all look very well structured, but I cannot make a choice!
Any of you have had experience with one of these? A different book advice?

Edit: I'm going to give up on Borovsky as it uses old annotation... and I found:
Aagaard - Excelling At Positional Chess which looks good as well.

I've only read teh Vukovic book, but it was great.  The new translation makes it easy to read and understand, and I liked that they offered all the games in algebraic notation as well.  I can't comment on the others at all, nor on whether or not the Vukovic book would be right for you at your current level of understanding.

Aagard is certainly too advanced for a beginner. Vukovic is also somewhat advanced, and I'm guessing that the other two books you mention are as well.

Instead I would recommend:

Chernev - Logical Chess Move by Move

McDonald - Chess: the Art of Logical Thinking

Snyder - Unbeatable Chess Lessons

Euwe - Chess Master vs. Chess Amateur

Stean - Simple Chess

Silman - The Amateur's Mind

Grooten - Chess Strategy for Club Players

Check out the reviews for these books on Amazon.com. You can look inside some of them as well.

Ok, thanks for the advice chessoholicalien! I'll check these books.

Edit: McDonald - Chess: the Art of Logical Thinking is just a detailed description of e4 and d4 openings. Not what I'm looking for.

Dvoretsky is much too advanced. I'd go with Chernev or Silman from that list.

Simple Chess by Stean is likewise admired.

http://www.amazon.com/Simple-Chess-Algebraic-Michael-Stean/dp/0486424200/ref=sr_1_1?ie=UTF8&s=books&qid=1256805078&sr=8-1

The Michael Stean book is very good,simple explinations.

Dvoretsky is very very advanced. My OTB rating is around 1650 and I found to be too hard. I'd say you go with Logical Chess Move by Move, and Modern Chess Strategy. But right now, focus on tactics.

Actualy I started studying Silman's "Reassess your chess" book and I suddenly start to understand a lot of things I wasn't even aware before!

I'm at page 97, reading slowly and taking note of important points and I already feel my chess is A LOT BETTER just after reading a few pages slowly! I'm a lot more comfortable in the middle game and know what to do and what not to do, take advantage of my and my opponent's position and attack at the right place at the right time.

This book is a must have for all those who have an average level and play only with short term tactics in the middle game without any concrete plan and without knowing where the opponent's weaknesses are. It's not full of unreadable annotations of masters' games like so many books. The few games presented fit perfectly with each chapter and helps understand Silman's point. Excellent chapters organization by theme of strategy, simple wording and to the point!

Reassess Your Chess will soon appear in a totally-revised 4th edition. I'd wait until then. It makes parts of the 3rd edition obsolete.

then I'll re-read it :)

Silman, Chernev, and Seirawan are excellent starts for a beginner. If you want a total package, just get Seirawan's Play Winning Chess series, it has openings, middlegame, and endings and is very clear and effective. Then study Silman devoutly.