I can proudly report success for the MQSeries channel for WSE 2.0.  At 8:18AM CST, the StockServiceClient was able to invoke the StockService using IBM WebSphere MQ 5.3 as the messaging transport and receive a response.

Hopefully Martin will forgive me for plowing through this rather than waiting.  Credit must go to him, though, as it was his code that got over the hump of WebSphere MQ being challenged within the CLR's asynchronous invocation model.

Technically, we could now implement a SOAP router that reads/writes between MSMQ and MQSeries for the purposes of SOAP messaging.  I wonder what impact this could have on the HIS bridge and the BizTalk connector?