Over on SOS Adrian has posted a set of slides that describe how to build multi-protocol, opensource, web services using JAX-WS.
The presentation gives a great overview of the architecture that allows Celtix Enterprise to deploy services that simulateneosly support multiple payloads (SOAP, XML, JSON) and transports (HTTP, JMS, AMQP). It also give some very helpful pointers on JAX-WS development in general - well worth checking it out.