Hi All,
I came across some fantastic articles on WCF in codeproject. One that particularly caught my attention was on Null Transportfor WCF by Roman Kiss (this article has got a mention from here too).
Other interesting articles on code project are :
http://www.codeproject.com/KB/WCF/WCF_Duplex_UI_Threads.aspx
http://www.codeproject.com/KB/WCF/WCFInject.aspx
http://www.codeproject.com/KB/WCF/EventDrivenComFoundation.aspx
Enjoy!