Easy Guide to the Nimzo-Indian, Emms (Cadogan 1998)
Lack of modesty prevents me from giving this book an objective review, so instead I'll give it a shameless plug. Written chiefly as a quick and easy guide for the black player, I give a repertoire containing 4...0-0 against the Classical and 4...b6 against the Rubinstein, plus all the main lines against White's other choices.
Nimzo-Indian Defence Classical Variation, Ivan Sokolov (Cadogan 1995)
Written by one of the World's leading experts on 4 Qc2, this book is the most recent work on the popular Classical Variation. All variations are covered, and despite being four years old now, the book has aged quite well (many of the lines and their assessments hold true today).
Nimzo-Indian 4 e3: Nimzowitsch, Hubner and Taimanov Variations, Pritchett (Batsford 1980)
Now sadly out of print, this excellent work by the Scottish IM Craig Pritchett was an inspiration to me, and the main reason I began playing the Nimzo. The book concentrates on the Rubinstein Variation, studying the Black replies 4...b6, 4...c5 and 4...Nc6.
The Nimzo-Indian Defence, Gligoric (Cadogan 1993)
With 338 pages, this is one of the most comprehensive books on the Nimzo around. Each and every line of the Nimzo is covered and I'd say that the book's strength lies in its study of the Rubinstein Variation, which is very extensive. The only grumble I would have is that its coverage of 4 Qc2 amounts to only one tenth of the book, which is a bit skimpy for White's most popular choice at GM level.
Mastering the Nimzo-Indian, Kosten (Batsford 1998)
Part of the Batsford "Read and Play Method" series, where much more emphasis is put on the pawn structures and relevant plans for both sides, rather than the nitty-gritty of the actual theory. This book works best in conjunction with a more theoretical work, or an openings encyclopedia.
Nimzo-Indian Defence, Ward (GM Video, 1998).
In this entertaining video, Ward chooses a repertoire for Black based on his own games with the Nimzo-Indian. This includes the tricky 4...b6 against the Rubinstein and the sharp 4...d5 against the Classical.
Modern Benoni Books and Videos
The Complete Benoni, Lev Psakhis (Batsford 1995)
A very good book, which covers all the Benoni lines in great depth, and also includes Benoni structures from the Four Pawns Attack and Saemisch, although these lines are generally obtained via the Kings Indian move order (see Andy Martin's King's Indian site). Psakhis is a successful and knowledgeable Benoni practitioner, and this comes across quite plainly in his work. The only thing going against it (and this is not a criticism of the book, but a reflection on its suitability now) is that some of the material on the Modern Classical is now out of date (the theory of the Modern Classical having moved so fast).
The Modern Benoni, Norwood (Cadogan 1994)
A more lightweight, but nevertheless enjoyable book from the young English Grandmaster. Norwood used the Benoni to score some excellent results in his chess youth (see his classic game versus Saeed in the Fianchetto Variation). At only 144 pages the book is not comprehensive by any means. However, the 20-page introduction explaining the roles of both White's and Black's pieces gives the reader a good feel of what the Benoni is all about. And there's also the refreshing honesty. Talking about the dangerous 8 Bb5+ (which Norwood aptly called the Flick-Knife Attack), he admits " The name of the game is survival", before ending on the more positive "but if you can confuse, bluff or bamboozle White you may find yourself coming out on top most of the time!"
The Benoni for the Tournament Player, Nunn (Batsford 1982)
The predecessor to Psakhis's work, this excellent work is no less than you would expect from John Nunn. Naturally it's a bit out of date now (as well as out of print), but much of the study in the less fashionable lines is still worth a look.
The Modern Benoni Ward (GM Video 1999).
Another entertaining video by Chris Ward, which provides the black player with a complete Benoni repertoire, plus what to do if White avoids taking the plunge with d4-d5. Ward bases Black's armoury around the early ...a6 lines which have been so successful for Black (see Statistics page).