I wanted to talk a little bit about the namespace changes in the Feb CTP of WCP (Indigo). With the new namespaces we feel that all classes are now present where its supposed to be (although we are open to suggestions if you feel some classes are misplaced). Previously all classes were under System.ServiceModel (close to 200). Also, from the feedback we found that System.ServiceModel.Design namespace really didn't fit in the programming model. So now System.ServiceModel namespace contains classes that will be used by users coding WCF services/proxies. We have created System.ServiceModel.Dispatcher and System.ServiceModel.Description which now holds classes related to runtime inspection, extension and description. The breaking change document summarizes the namespace changes just right.
Note: You will find that some properties used by standard bindings are not in System.Servicemodel namespace and thats a known issue. We have already fixed it but unfortunately it didnt make it to the Feb CTP.
So here is how we envision users using the namespaces.
o I want to write Services (include System.ServiceModel) o I want to configure Services imperatively (include System.ServiceModel.Description) o I want to add a little extension (include System.ServiceModel.Dispatcher) o I want to add a new aspect to the channel layer (include System.ServiceModel.Channels)