I was wondering if anyone has tried to implement any of the "Gang of Four" design patterns in WMB. (BTW its not the Band or the Chinese dissidents), http://en.wikipedia.org/wiki/Design_Patterns
The Facade Pattern and the Mediation Flow in BPEL appear to be the only ones by name.
Observer works for the MQ pub sub.
Although not GoF patterns, the common Front Controller, Dispatcher and Service to Worker patterns would seem to be most useful in WMB.