By now, if you're doing XPages development, you likely picked up a copy of "Mastering XPages: A Step-by-Step Guide to XPages Application Development and the XSP Language". You've probably also heard about, but possibly been afraid of the Extension Library. Well, fear no more. This book tells you everything you need to know to install and use the extension library.
Part I: The Extension Library, Installation, Deployment, and an Application Tour
Chapter 1 The Next Generation of XPages Controls
Chapter 2 Installation and Deployment of the XPages Extension Library
Chapter 3 TeamRoom Template Tour
Part II: The Basics: The Application's Infrastructure
Chapter 4 Forms, Dynamic Content, and More!
Chapter 5 Dojo Made Easy
Chapter 6 Pop-Ups: Tooltips, Dialogs, and Pickers
Chapter 7 Views
Chapter 8 Outlines and Navigation
Chapter 9 The Application's Layout
Part III: Bells and Whistles: Mobiles, REST, RDBMS, and Social
Chapter 10 XPages Goes Mobile
Chapter 11 REST Services
Chapter 12 XPages Gets Relational
Chapter 13 Get Social
Part IV: Getting Under the Covers with Java
Chapter 14 Java Development in XPages
As you can see, this is a power-packed book, with lots of information. One of the things I really like about this book, is that it is written by members of the Xpages community, not just IBM employees. For example, Declan Sciolla-Lynch wrote a comprehensive tutorial for XPages on his blog back in early 2009, that many people still use now to learn XPages. Many (if not all) of the authors are commonly seen presenting at conferences, blogging their ideas, and answering questions about XPages on Stack Overflow.
The book really is a step-by-step guide, taking you from download of the extension library, to installation, to coding and deployment. If you are doing XPages, you need to be using the extension library, and if you're using the extension library, you need this book.