Finally and after I have bought and readed your PHP Web Services book, which I have learnt a lot and enjoyed. I have bought your Zend Certification Question Pack right now and Now I'm going to start with it.
I have readed in this post that you have another book PHP Master, Write Cutting-Edge Code, and I have been taking a look in amazon to it, and I have readed the Book Description and I'm interested in it. But by the moment I will study the the question pack.
My plan is take the exam in November or December, given, I have a lot of PHP work in my company and I don't have a lot of time to study and I want to get there enough prepared.
I already will tell you!!