Yasser Seirawan's "Winning Chess Tactics" and "Winning Chess Strategies".
Good tactics/strategy chess books
I have been reading many of Jeremy Silmans books lately. He has an excellent writing style for chess instruction.
Chess Tactics by Paul Littlewood is an excellent tactics primer which can be picked up cheaply second hand on Abebooks
Sharpen your chess tactics in 7 days by Gary Lane is also a good book covering tactics in the opening, middlegame and endings
Improve your chess tactics by Yakov Neishtadt is when you want to go further and is a highly regarded book.
Tactics book
Chess Tactics for Champion by Polgar
Winning Chess Tactics by Seirawan
Ultimate Chess Puzzle book by Emms
1001 Deadly Checkmates by Nunn
Strategy Book
Winning Chess Startegy by Seirawan
Chess Secrets: Giant of Strategy by McDonald
Chess Strategy For Club Players by Grooten
Strategy
My System - Nimzowitsch
The Middlegame I & II - Euwe
Modern Chess Strategy - Pachman
Questions of modern chess theory - Lipnitsky
Chess Middlegame Planning - Romanowsky
The Art of Middlegame - Keres & Kotov
Judgement and Planning in chess - Euwe
Play like a Grandmaster - Kotov
Secrets of modern chess strategy - Watson
Secrets of Positional Chess - Marovic
Understanding Pawn Play in Chess - Marovic
Dynamic Pawn Play in Chess - Marovic
Pawn structure chess - Soltis
Improve your chess by learning from the champions - Lars Bo Hansen
Learn from the legends - Marin
Winning pawn structures - Baburin
How to choose a chess move - Soltis
Chess Strategy for club players - Grooten
How to Reassess your Chess 4ª Ed - Silman
Tactics
Art of Attack in Chess - Vukovic
The Art of Sacrifice in chess - Rudolph Spielmann
Kombinationen - Kurt Richter
Combinations in the middlegame - Bondarevsky
Middlegame combinations - Romanovsky
Attacking Manual I & II - Aagard
Storming the Barricades - Larry Christiansen
Rocking the Ramparts - Larry Christiansen
Excelling at Combinational Play - Aagard
The Art of combinations - Blokh
Chess School 2- The Manual of Chess Combinations - Ivashchenko
Chess School 3 - The Manual of Chess Combinations - Mazja
Anthology of Chess Combinations - Informator
How to Calculate Chess Tactics - Beim
Dynamic chess strategy - Suba
The Inner game of chess - Soltis
List of chess books.