Where can I find some good WS-Security introductions and tutorials?

Question

Can anyone point me to some decent introductions to WS-Security?

I'm looking for tutorials or something that provide a fairly gentle introduction to the subject, though I don't mind if it assumes basic knowledge of web services and SOAP. Most of the stuff I've seen so far is very technical and you need a lot of complex, detailed background knowledge to understand it properly.

We have to implement a web service in PHP and one or more clients in .NET, so resources covering both would be much appreciated.

Answer 1

I think the best introduction to the (any) subject are some good examples.
This article at codeProject gives a fairly easy to follow guide trough web service security for a .NET application.