What Are Google AdWords -- What exactly are Google AdWords? What do all those sometimes confusing AdWord terms mean? What do you need to know before you sign up? If you're considering advertising on Google, this article has the information you need to know before you get started.

Mac OS X: The Missing Manual, Tiger Edition -- As soon as Apple comes out with another version of Mac OS X, David Pogue hits the streets with another impeccable Missing Manual to cover it. This new edition explores the latest features in Mac OS X Tiger, such as Spotlight, iChat AV, and Automator. Ideal for every user, this guide has something new on every page, along with David Pogue's celebrated wit and expertise.

Perl Testing: A Developer's Notebook -- With this series of hands-on labs, you'll learn how Perl's test tools work and how to use them effectively. Once mastered, these lessons will help you ensure low-level code correctness, reduce software development cycle time, and ease maintenance burdens. You don't have to be a diehard Perl developer to use this book; you just have to want to do your job a little bit better. Sample Chapter 4, Distributing Your Tests (and Code) (PDF), is available free online.

Advanced Perl Programming, Second Edition -- O'Reilly's most high-level Perl tutorial to date, this book teaches you all the complex techniques for production-ready Perl programs. This completely updated guide clearly explains concepts such as introspection, overriding built-ins, extending Perl's object-oriented model, and testing your code for greater stability. Whatever your current level of Perl expertise, this book will help you push your skills to the next level. Sample Chapter 3, Templating Tools (PDF), is available free online.

Is Perl Still Relevant? -- With the emergence of .NET, J2EE, Python, PHP, et al., one reader asks whether Perl has lost its niche as a scripting glue language? Tim O'Reilly comments in this Ask Tim.

JBoss: A Developer's Notebook -- This Developer's Notebook takes you on a complete tour of JBoss in a very unique way: rather than long discussions, you will find code--lots of code. In fact, the book is a collection of hands-on labs that take you through the critical JBoss features step-by-step. Don't just read about JBoss, learn it through direct practical application. Sample Chapter 9, Rolling Out JBoss, (PDF) is available free online.

UML 2.0 in a Nutshell -- This comprehensive guide has been crafted to help IT professionals read, create, and understand system artifacts expressed using UML, and it's fully revised to cover UML 2.0. It not only provides a quick-reference to all UML 2.0 diagram types, it also explains key concepts in a way that appeals to readers already familiar with UML or object-oriented programming concepts. Also includes an example-rich tutorial for those new to the system. Sample Chapter 7, Use Case Diagrams (PDF) is available free online.

Maven: A Developer's Notebook -- If you're a Java programmer, this book will arm you with all the critical information you need to get up to speed on Maven. It forces you to get hands-on experience by working through a series of poignant exercises that speak to you instead of at you. In the end, you'll find yourself spending less time working on your project's build system and more time working on your project's code. Sample Chapter 1, Maven Jump-Start (PDF) is available free online.