It is my understanding that SOA Using Java� Web Services (amazon US) may be of some help as it may make it easier for you to understand Java-based web services in general. However the book seems to deal with JAX-WS in the context of Java SE 6 or Java EE 5. The SCDJWS certifies you for JAX-RPC 1.1 (and XML 1.0, XML Schema, SOAP 1.1, WSDL 1.1, WS BP1.0a, UDDI 2.04, JAXR 1.0, JAXP 1.2, JAXB 1.0, SAAJ 1.2, Servlet 2.4, EJB 2.1) in the context of J2EE 1.4 � these older specifications are quite a bit different. So you would still have to cover the material presented in
I'm not sure what material exactly is covered in the SCJWSD.
Like Peer said, however, my book is focussed on Web Services for Java EE 5 and Java SE 6. It would be an excellent study guide for JAX-WS 2.0, JAXB 2.0, JSR-181, and JSR-109.
However, if you need to study Web Services in the the J2SE 1.4 specification (i.e., JAX-RPC 1.1, JAX 1.0, etc.) then Richard Monson-Haefel's book is the definitive reference. And, like Peer said, always include the Java Blueprints in your studies.