Adam Tracy and Robert Hanson have posted a really nice, comprehensive GWT demo to go along with their book, GWT in Action. From Adam’s post on the newsgroup, the demo includes:

…menus loaded from XML, drag and drop, internationalization, RPC server communication, sliders, editable labels, widget functionality restricted to locales, several new widgets (including menu items with toggle-able images and generally uses as much of GWT as we could cram into one application!).Loads of events are handled via different components, including double click on the windows, window close events and overiding default browser functionality (for example, the book icon can be dragged to the browser’s location bar but the trash icon cannot).

The application also uses GWT Generator technology to “introspect” at compile time the component applications to show the methods and fields available; JSNI is employed to wrap the Google AJAX search component (together with the Video search extension) and we use proxy servers to call the Yahoo Search functionality. GWT RPC is used to query data from the running server – and there’s much much more.

The demo is pretty slick and the book is supposed to describe how to create the full app. Also Adam has mentioned that the entire book is now available via the early access program. So check it out.