Thanks for the answers about the QID.
Now tell me about the latter position (see diagram "2" above), 
after 1.Nf3 Nf6 2.c4 e6 3.g3 b6 4.Bg2 Bb7, 
when white avoids the move d2-d4. (Playing d2-d3, for example.)
What book(s) should I look for? (I encounter the position only as Black.)

I completely forgot about Well's book even i have it and it is on my table because i used it as a reference for one of my games.
May be in addition you may take a look at Chessbase CD How to play QID and also at Aagaard's DVD - Easy way QID.
There is one more book - i think it was authored by Geller & co and was something like Understanding QID.

P.S. Just found the title - Soltis, Andy, Edmar Mednis, Raymond Keene, and John Grefe. "Understanding the Queen's Indian Defense." Great Neck, New York: R.H.M. Press, 1981. It is rather old but I still think you will get good ideas from it.

HoemberChess wrote on 10/16/09 at 22:14:56:


I think that would be the Catalan.

kylemeister wrote on 10/16/09 at 21:13:47:


Also recommended in "A Strategic Opening Repertoire" Donaldson & Hansen, 2007.
And the "Well's book" is in the Chess Explained series (by Gambit).

I used to play the g3 QID hoping for the Polugaevsky Gambit:  1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.0-0 0-0 7.d5 exd5 8.Nh4.

But I never had a good answer to 4..Ba6.  What do you propose against that?

Some titles which I can mention are:
1) Starting Out - Queens Indian - Emms - Everyman, 2004
2) The Queens Indian - Yrjola & Tell - Gambit Publications
3) Play the QID - Greet - Everyman, 2009
4) Queens Indian Defence - Jacob Aagaard - Everyman, 2002

Question 1) 
I am looking for books on the Queen's Indian Defense with 4.g3 from White's perspective. I intend to play this as White but I am very new to the QID, I have not played it with either color. 
(I don't like the look (and type of middle-game) of 4.a3, the Petrosian Variation, while 4.e3 is inconsistent with my 4.d5 versus 3..c5, the Modern Benoni, that's why I want to play this "classical", 4.g3 form of the QID as White.)


Question 2) 
Also I am looking for books for Black, because I intend to take up the 4.g3 Bb7 variation. (Which, in my games, can arise only after the specific move-order, 1.Nf3 Nf6 2.c4 e6 3.g3 b6 4.Bg2 Bb7 with d2-d4 coming later, for otherwise, after 1.d4 Nf6 2.c4 e6 3.Nf3, I defend the Bogo-Indian rather than the QID.)
(Some years ago I saw a chesslecture.com video by David Vigorito on the subject, that's where I got the tip)