My day-job project is being done in Seam... it does seem quite rails-inspired, and comes with a lot of free scaffolding and tight integration with Hibernate. We are using jBPM, too, which also gives a lot of free scaffolding.
Yes, I've used seam for several projects and found it to be an amazing framework that lends itself to rapid development and web apps that can take a Slashdotting+Digging on the same day.
Plus is has great integrations with Ajax4JSF and RichFaces which makes adding a nice Ajax front end very very easy, even if you don't know much JS, like me.
Plus is has great integrations with Ajax4JSF and RichFaces which makes adding a nice Ajax front end very very easy, even if you don't know much JS, like me.