I have missed ever in this tool the ability to setup the pom.xml file for a maven project. Maven is widely used in most java projects, and it was a pain to create your pom.xml file from scratch each time you create a new GWT project.
Last time I gave a talk about the basis of GWT I had to explain how to do this by hand, and I said that It would be easy to add this feature, so I went ahead with it and I produced a patch which has been included lately in the GWT core.
Although the feature will not be abailable until the next GWT release, fortunately GWT-2.1.0 is comming soon since millestone one has been already published.
To start a new GWT project from scratch just type:
$ webAppCreator -maven -noant com.example.MyApplication