I think that .project, .classpath and .checkstyle files should be included. All the other samples have those files imported. It is possible to create the eclipse project from sources but I think it would be much more convenient if the project was already created for the user. I also think that this should be added for the sake of consistency with other projects.
http://gwt-code-reviews.appspot.com/641801/show -- http://groups.google.com/group/Google-Web-Toolkit-Contributors
