Web developers already know they can use Ajax to add rich, user-friendly, dynamic features to their applications. With the Google Web Toolkit (GWT), a new Ajax tool from Google that automatically converts Java to JavaScript, they can build Ajax applications using the Java language. GWT lets developers focus on application design and functionality, rather than on browser differences, and allows them to re-use code throughout the layers of their applications. GWT in Practice is an example-driven, code-rich book designed for web developers who have already learned the basics of GWT. After a quick review of GWT fundamentals, GWT in Practice presents scores of handy, reusable solutions to the problems developers face when they need to move beyond Hello World and proof of concept applications. This book skips the theory and looks at the way things really work when developers are building projects in GWT. The Market: The GWT approach of using a static language to create cross browser compatible code is becoming very popular even beyond Java and GWT. There is a Microsoft effort to do the same using C#, along with Python and Ruby variants. Based on mailing list activity, Java User Group focus and buzz, GWT itself is rapidly increasing in popularity. Java developers love using Java rather than JavaScript to build Ajax applications. This feature alone promises to make GWT a widely used tool for Java developers.