In the last Google I/O was anounced that GWT 2 will have support in Spring Roo. I never heard of Roo before and I wanted to take look (http://www.springsource.org/roo).
It seems that Roo improves the development by maintaining all the interfaces, stubs and glue code that is boring when you use GWT or Entities.
I just ran two of the demos...a classic Spring Controller Roo Project with handling the CRUD of a Concat entity (http://s3.springsource.com/MRKT/roo/2010-01-Five_Minutes_Roo.mov):
So far it was pretty impressive to make an entity based application in 5 minutes without all the glue code, but as this is a new concept I wonder if anyone has done any real large sized project supported in Roo....