I have posted my first WCF demo in this new series I am attempting.  This one focuses on duplex operations and some of the quirks that can arise when interacting with UI threads.  Due to the length, I have posted it as an article rather than a blog entry.  Most likely, all of my future demos will be posted in a similar fashion to avoid bogging down the RSS feed with so much content.

UPDATE:  I have also posted the article on Code Project.

UPDATE: Since I intend to begin writing articles on a regular basis, I am going to exclusively use Code Project for hosting them.  I will make a blog post with a link to the article when a new one has become available.  This will greatly assist me with editing and code corrections by only having to make changes in one location.  Consequently, I have deleted the version of the article that was hosted on my site.  Once I have a few articles, I will setup a table of contents page to better organize my articles on Code Project.