I'm still waiting to find a good introduction to Windows Communication Foundation (aka WCF aka “Indigo”). I want an article or book that explains even the simplest foundational concepts; something for a client application developer like myself who is realizing that his code will eventually have to talk to that newfangled “Internet” he keeps hearing about.

A recently published MSDN article comes close, but it still uses too many big words. What little I understand sounds compelling, though, so I'll keep waiting...