Hi!
Right, the Monson-Haefel book is already eight years old and there is not a more recent version.
It is still very good, but do skip the areas on JAX-RPC and perhaps also UDDI, depending on the version of the certification you are aiming for.
If you haven't found it already, do have a look at my (free) electronic book:
http://www.slideshare.net/krizsan/scdjws-5-study-notes-3085287
It is written for the
Java EE 5 version of the web service certification, but I believe that most parts are still valid for the Java EE 6 version.
If you have any further questions, please do not hesitate to ask!
Best wishes!