GWT Developer Tips - Your Back Button Matters
What I've learned from using Google Web Toolkit - your web app's back button is important in making your app behave like a normal website. Google Web Toolkit's History class will come in handy.
Michael Bayne of Three Rings and creators of Whirled, a social virtual world website built with Google Web Toolkit.
Learn more about GWT at http://code.google.com/gwt