I'll speaking in Munich next monday (12.04):
In this presentation we'll see how to organize a nontrivial GWT application. We'll go through the lessons learned in a real world project and take a look the complete development lifecycle and best practices that go beyond what GWT has to offer out-of-the-box. This talk does focus on modularity of GWT applications and how to overcome the burdens of compile-time linking. We'll talk about client side patterns and server side implementation options and explore different approaches that allow for quick turn around times without sacrificing maintainability.
Details can be found here