For those Apple lovers out there (woo!), there's a new article from those "different" minds about using web services with SOAP and PHP. Now, this article isn't Mac-specific, but it does mention Macs in a few places.

The article gives you a good overview of working with the SOAP and PHP technologies to send messages back and forth between a client and the server that understands the SOAP protocol. Of course, they give you some sample code for both the client and the server (a simple one, but still a server), and show you how to use them to communicate with each other.

It's not a bad introduction, but don't expect to become a SOAP expert by reading this. They laid a good foundation, and, thankfully, they give you lots of links to other resources for more about SOAP and more about integration of it with PHP (especially with the NuSOAP classes).