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You can use Play! with scala as well, so you get a good framework AND a more interesting language at the same time ;)

Yeah, never heard of it until now. If I ever venture out into Java land again, I'll have to give it a better look. How does it compare to Grails?

I've never looked at grails so I can't offer an opinion but I have some links that may be helpful to you. The first is a HN discussion on the play framework and the second a discussion on google groups about the differences between the two frameworks.

http://news.ycombinator.com/item?id=898738

http://groups.google.com/group/play-framework/browse_thread/...

playframework is way better than rails in my opinion

No comments about the Lift framework ? FourSquare uses it

Watched the screencast. First thought when I saw 'SomeClass extends Controller': this will be hard to evolve.

Tapestry 5 has done away with this and does not require interfaces or superclasses anymore in order to avoid breaking the API in future releases, they should have learned from that.