Check out this quick & to-the-point comparison of the leading RAD web frameworks:
http://prezi.com/n9re7-x9guah/django-and-rails-and-grails-oh-my/
A study which focus on these three Application Frameworks from different perspectives like What companies are looking for, What is the future trend? etc.
http://completeopensource.blogspot.com/2009/04/open-spurce-application-f...
