Ext JS is one of today’s hottest emerging Web 2.0 Rich Internet Application (RIA) technologies. It’s essentially a pragmatic framework and library (with widgets) that lets Web developers and designers easily use to build JavaScript-based Web application front-ends (Graphical User Interfaces or GUIs) and simple applications. This book by esteemed industry expert and author Frank Zammetti will likely be one of the first, if not first, books on Ext JS framework.