Hi, I made a run time UiBinding prototype. This allows for the creation of forms or screens without having to recompile. Let me know if GWT or the incubator is interested. If so I will release the code as an open source project on google source.
Here is the prototype hosted on Google App Engine http://gwt-binding-fly.appspot.com/ -- http://groups.google.com/group/Google-Web-Toolkit-Contributors