I've found that the best way to get to understand a particular technology is play around with it. As such, when I started working on a WCF project for one of my customers I created a simple test harness that let me play about with WCF Service Contracts and WCF Data Contracts quickly and easily.  Anyway, I've made my WCF test harness available here:

The test harness uses RhinoMocks to mock out my WCF Services and NUnit to enable a simple set of automated unit tests.

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