Just wanted to say congrats to the Seam guys who have added Groovy support to the latest 2.0 beta. I know they (Gavin, Emmanuel etc.) have been putting a lot of hard work into making Seam easy to use whilst still trying to remain true to the Java EE standards and I think adding dynamic language support, in the shape of Groovy, is a great step in the right direction.
I've said it before and I'll say it again, one of the reasons the Java eco-system is so fantastic is you have a choice. Sometimes too much of a choice, but it is a wonderful space to be in.