There is a nice interview with Refactr. An agile software consultancy who have seen the benefit of Grails and are embracing it in a big way. They talk about agile methodologies, working with clients in a consultative manner, their past experiences and why they choose Groovy and Grails for a lot of their work.
There views reflect the essence of Groovy and Grails and the appeal to existing Java developers with its tight Java integration and seamless integration with legacy Java systems.
PS Grails 0.4.2 is out