The document discusses key features of Google Web Toolkit (GWT), including widgets, server communication using RPC, and open source libraries. It provides an example of a shuffle box application using GWT widgets like RootPanel, HorizontalPanel, and VerticalPanel. The example demonstrates transferring items between two list boxes when an item is clicked. Finally, it lists some third party GWT libraries including GWT Showcase, EXT-GWT, Vaadin, and Smart GWT.