Davey Shafik has posted another update on his web services component he's working up for the Zend Framework, the Zend_Service_Server.
I have been working closely with Matthew Weier O'Phinney for the last week on bringing my Zend_Service_Server proposal to fruition.
There have been several changes, but the core has not moved too far. Matthew, Andi and I have decided that we will first implement the different server/client libraries.
He lists the libraries they'll need to tackle first and talks about an "exercise" he did to work up a JSON server component that works in a similar fashion.