Although technically mygwt didn't really have an open trunk until a couple of months ago, my vote would also go to have the trunk available until gxt/ext-gwt is more feature complete and stable (at least until it's on the production version 1.1 I think).
I believe that the GPL license change maybe sufficient for folks that consider using the software in commercial environment to purchase the license and support.
I'm not using mygwt in any production software (not yet anyway) - but quite interested in following on the development progress since I think it's a very promising RIA framework.