This is a great article, Jon; I have to stop and think about these things all the time. How do you feel about the fact that in certain cases, when enough people use a word incorrectly for a long enough period of time, the incorrect usage becomes accepted as correct? I know diehards rail against this.
WCF includes a message framing protocol that is called .NET Message Framing for use with transports that do not natively support messaging. This framing protocol is used with the TCP transport to create NetTcp and with the MSMQ transport to create NetMsmq.
This is definitely true for the Password Nonce as part of the WS-Security/WSE protocol, which is not natively supported in WCF. Specifically I had a need to create a WCF message on the client that includes a WS-Security header that looks like this from their spec document: