Andrew Johnstone has a new post today with a look at a project he'd worked on - an implementation of a web service with the Zend Framework functionality.
I was recently working on a project to expose our trading systems via XmlRpc, Rest and SOAP. It was quite an interesting project, which took two of us three weeks to develop (Amongst other things).
He talks about some of the issues they worked through (like the ZF's "not quite ready" in the web services department) and problems they found with how the web services functionality was implemented in the framework's components. They also came across two strange bugs - one with accepting raw input and the other with a wrong return type from a method call.