I can proudly report success for the MSMQ transport provider for WSE 2.0.  At 4:35PM CST, the StockServiceClient was able to invoke the StockService using MSMQ as the messaging transport and receive a response.

We're using WS-Addressing to facilitate request/response semantics over an asynchronous transport.  Very cool.

We should have a working MQSeries transport before the end of the day.