Microsoft has just released a Web Services Software Factory. From what I have been able to digest so far it's not to bad especially from a getting started standpoint. I'm actually working on something similar for our webMethods Fabric layer. It follows a similar architecture but with a lot more messaging injected into it. It's a bit of a hybrid approach to EDA and SOA styles of architecture with messaging and web services as a foundation.
Obviously the Microsoft provided architecture could apply and be implemented with any other platforms that support web services. Microsoft does provide actual examples of the implementations with the download they provide. That means you are going to have to have VS 2005 in order to run the stuff. Yes I can hear the collective sigh.