Houston: we have Jersey 1.0!
I'm sure this has already been reported by gazillion other blogs, but just in case you managed to miss it, Jersey 1.0 Has Been Released.
So what is Jersey? It is production-quality reference implementation of "standard Java Rest API", JAX-RS. And although I have not really yet had a good enough excuse to try it out for building a real production web service, I would not hesitate using it, based on discussions on user and developers lists, if Restful modeling suits the service to implement.