Getting started with Unity3D's networking

I'm looking for some networking tutorails to get started with Unity's standard networking system. I read all the documentation available on the subject and poked around looking for some tutorials, but I didn't find any good ones other than the iPhone tutorial (which doesn't really apply to me, does it? I'm targeting PC/Mac) and the M2H tutorial, which now costs rather more than I can afford. Are there any more good tutorials floating around? Or perhaps, failing that, would somebody be kind enough to give me a bare-bones intro which I can build off of using what I learned in the documentation?