Tee hee hee.. I like the comments where poker books are not recommended and that experience is the way to go... but also notice that the one has only read one poker book? (how could you form an opinion then... in my opinion... hee hee).
I agree with alot of what has already been said above. Phil Gordon's books are great and he is also a decent writer (which helps... take in comparison Doyle's books.... ).
Harrington series is also a definite must for anyone wishing to make a go of NLHE tournaments.
I too have read dozens of poker books (and re-read some many times over). My favourite book at the moment though is 'Winning Poker Tournaments - One Hand At A Time' by Eric 'Rizen' Lynch, Jon 'apestyles' Van Fleet, & Jon 'PearlJammer' Turner. In it's 400+ pages it goes over 194 problem hands (more difficult situations,.. difficult hands to play in certain circumstances). I would for sure read all of Harrington's books first though (and Gordon's as well wouldn't hurt any) and of course play a bunch (but that goes without question, right?..lol). The book is broken down into 4 parts, 1 part for each player to comment on a bunch of different hands, taking you through their thought processes, etc., then at the end there are a bunch of hands posted that were played by Mathew Hilger with comments from each of the other 3 players/authors on how they would've played out those hands (without any of them having prior knowledge of what the other player has written about the particular hand). The last hands chosen by Hilger specifically due to them having been 'problem hands' for him that he had played out in the past.
It's a great book but definitely geared to more advanced play. In it they describe playing in a bunch of the online tournaments that many of you are very familiar with and then gear their play towards the playing field in them. Alot of the stuff in the book would need to be toned down some for cheaper buyins ($100 & under) but is great stuff and can really help one to expand on one's thinking about the game.
GL!!