Groovy looks very interesting indeed. What it currently lacks WRT Rhino-based Javascript is continuations. The really important part of Cocoon's Flowscript is continuations, not the Javascript syntax. If it had continuations I might consider switching from JS to Groovy very seriously.
I wonder if the need could be solved with Groovy's support of closures? It will require some brainstorming, but it might be possible :)
-pete
