Better Web Application Framework: Followup

While going through my feed-reader today, I came across another potential framework, which I can add to the list mentioned earlier. This is Project Zero, an incubator project being developed by IBM. It uses the Java platform and the scripting languages Groovy and/or PHP and seems to be directly targetted at RESTful services development but with support for traditional web applications, AJAX and mashups. I guess that I am going to have to I develop a data model and evaluate the choices that I have before I get even more confused!