Works best for beginners.
If you are starting out in Texas Hold'em this is the book I recommend that you begin with. If you already have tried it a bit, and have decided which game structure (Limit, No-Limit, Tournaments or Sit & Go's) you will focus on, you might want to look at the other recommendations as well.
Getting Started in Hold'em begins with the very basics of the game like poker hand rankings, identifying best possible hand and so on. Then there is a brief coverage of the different game types. It is enough to get you started in either game I think.
The Limit chapter gets the best coverage, which is understandable since Ed seems to be mostly a limit player.
The No-Limit chapters are fairly brief, but they do have an interesting strategy for buying in short (which a lot of players seems to be using). It is a low risk strategy (but a bit boring) to get started with the complex game of No-Limit Hold'em. It makes the decisions a lot simpler.
In summary I think this is a well written book that will give you a good start in Texas Hold'em.

This book is based on interviews with some of the best No-Limit Hold'Em players in the world. You might recognize names like Daniel Negreanu, Dan Harrington and Chris "Jesus" Ferguson. Each "Wizard" gets a chapter which gives you insights into how they are as persons and how they play the game. I think this book is an excellent read if you want to find (or change) your personal style of playing. There are many different ways to approach the game and this book provides you with an overview of different, yet all very profitable, ways of doing it.
If you have read a lot of other poker books you might not find that many new ideas here, but I still think it is an entertaining and interesting read even if you have. I have reflected more on the values of manipulation and reading your opponents character and tells after reading this.
And best of all, it has actually inspired me to start playing live poker again!

Works well for both beginners and advanced players.
This are THE books on No-Limit Texas Hold'em tournaments. I can't see how you can become a really good tournament player without reading them - unless you spend years practicing or have personal coaching. Harrington has a very complete and well written coverage of No-Limit Hold'em tournaments. I only have one negative thing to say about them and that is; do not expect to become a good Sit And Go player through reading them. I did quite ok after reading them but it took me a couple of years to realize that my play at the so called play around the bubble (close to the prize money) was quite messed up. See below for recommendations for Sit And Go's.

Works best for advanced players.
Yeah, yeah, I repeat myself. What can I say, Harrington is good! A whole book where you can practice yourself under Harrington's guidance. The book is in a quiz format with well described problems, and solutions with excellent hand analysis. Not a must read like I and II but still a very useful (and actually entertaining) book. You get a score for each quiz depending on how close you were to the best answer. I read it a couple of year ago and score 372 which ranked me: "A player with a solid base of skills to build upon". Not to good for a Pokertrainer, eh? To my defense I can say that I did lousy on the Sit And Go questions, and I actually blame the first two books for that. I will do it again sometime soon I think...

Works well for both beginners and advanced players.
A very entertaining and educational book from one of the greatest players in the world. In this book Gus goes through every hand (almost) he played in the Aussie Millions 2007. You should never reveal the ending of an exciting book, but here I go anyway - he wins! Gus explains in a lot of detail what his thoughts were around other players, how he read the hand, the bets, his strategies and everything. You really get into the mind of a great player!

Works best for advanced players.
Written by a number of great players, e.g. Andy Blooch, Chris Ferguson, Ted Forrest, Phil Gordon and Mike Matusow. I learned a great deal from this book. Each player gets his own chapter, e.g. Chris Ferguson has a chapter on "How to bet" and Andy Bloch has a chapter on "Play before the flop". Some of the thoughts around the more advanced practices on this site comes from Bloch's ideas. They try to keep the chapters together through the book, but it is difficult with so different kinds of playing styles. This is not really a problem if you are an experienced player and can take their advice and put it into your context. But as a beginner I think it is difficult to create your own way of playing if this was to be your first book. Highly recommended for experienced players! Covers many ideas I haven't seen anywhere else.

Works best for advanced and theoretical players.
This must be one of the most underestimated poker tournament books out there. Or poker books at all for that matter. What's so great about it then? It actually really explains the bubble and how to handle it. Fully, in detail. In ways that really helps you take the right decisions. There is a huge amount of information and advice on the internet on how to handle the bubble. But a lot of it is plain wrong, and that makes it very difficult to create a strategy for it. And that's where this book comes in. And it is based on thorough mathematical analysis combined with deep poker understanding. If you don't know what the Bubble Factor is and how to use it, or what range of hands are optimal (in a way that can't be exploited by your opponents) to move in with when you have an M (also see Harrington for this) of 6 and there are 4 players left to act - then you really need this book! It actually even goes so far as to explain optimal push/fold strategies for play both with and without bubble (can also be used for cash games). And it explains how the bubble behaves differently depending on the size of the tournament and the structure of the prices. By the way, do you know why it is mathematically correct (provable) to play very tight in the beginning of Sit And Go's? It is because there is a bubble effect at the very first hand of a Sit And Go!

Works well for both beginners and advanced players.
This is the best one I have read on No-Limit Texas Hold'em cash games. It has a fairly complete coverage of No-Limit cash games for Hold'em. But I would be a bit careful playing as loosely as recommended by this book if you play in fairly tough full-ring games on the internet.

Works best for advanced players.
This book is best for fairly advanced players for two reasons. First of all it covers only fragments of the game. Second I think some of the advice is dangerous and wrong. But if you are an advanced player and can think for yourself you can still learn a lot from this book. They define two new concepts in the book: REM and SPR. REM stands for Range, Equity and Maximize. Not new thoughts but well explained. You can practice on Range in several of the exercises on this site. SPR stands for Stack-To-Pot Ratio. With the help of SPR and other tools they explain how to think about commitment. Several other books also talk about commitment, but this is by far the best I have read around that. For instance if you are up against one player on the flop and you have and idea about how loose he is, at what stack sizes will you win money by commiting on the flop with top pair, top kicker? They explain how to think about commitment for other situations than the flop also. The best parts in the book are the REM process, the SPR concept, pot control and commitment. So what is the bad parts then? I think they are completely off target when it comes to how they recommend manipulating the Stack-To-Pot Ratio before the flop. They seem to have a very naive way of doing that which is aimed at having an easy decision after the flop. I agree that it is good to avoid close call situations when feasible, but if you base your entire preflop game on it I think you are in trouble. In this part of the book they do not seem to consider other aspects of the game like for example risk-reward and deception. Strange, without this flaw the book would have been outstanding. I still recommend it warmly to advanced players, you can get a great deal out of it if you watch out for the murky parts!

Works well for both beginners and advanced players.
This book works well for both beginners and advanced players. However, I do recommend that if you are a beginner you buy this item, and if you are a more experience player you buy Small Stakes Hold'em. An easy read with lots of valuable information. It will provide you with a very sound basis for Limit Texas Hold'em if you are a beginner. Advanced players will surely also pick something up from this gem. Both this one and Small Stakes Hold'em teaches a modern, aggressive way of playing poker.

Works better for advanced players.
This is a really great book for players who want to really maximize their winnings in low limit Texas Hold'em. I think it has a much better fit to internet games up to lets say 5/10 $ than Sklansky and Malmuth's Hold'em for Advanced Players (which is also quite good). This book describes a very modern, very aggressive way of playing where you really try to maximise profit from your opponents mistakes. The drawback is that it is a style of playing that is difficult to learn, and it can be costly until you have mastered it.