GWT4NB is the GWT plugin for Netbeans. Check the article here to get started.It looks neat and really help full for the starters. If you are Eclipse user, like me, you can check, Cypal Studio and GWT Designer. GWT Designer is commercial and it got graphical editor, have features like previews, drag and drop (Both features are very useful for prototyping, can not rely on it for production) . Try the trail version before going to buy the license. For me, Cypal Studio, is more than enough to get the job done.
The issue is all about Sun trying to make NetBeans and Java, a Siamese twin. Bill Roth from BEA and others was not happy about the announcement of NetBeans 6.0 in JavaOne opening keynote. Their argument is justified after all it is JavaOne, not SunOne. These days, if you have experienced any Java related session on X technology, from Sun, you would have felt that ‘How to instantly cook X on Netbeans’ would be apt name for the session. It is almost like one of those weight loss equipment advertisements. They should seriously consider separating Netbeans from X sessions. Read the news.