The Microsoft patterns & practices is really keeping busy: after a new release of the Web Client Software Factory they have now announced a new addition to the p&p library, the Web Service Software Factory: Modeling Edition for Visual Studio 2008.
The Service Factory contains automation and guidance integrated into Visual Studio 2008 for building Web services. The core of the automation components is a Web services domain model. This domain model contains elements such as service contracts, operations, messages, and data contracts. This domain model manifests itself in the form of three integrated domain-specific languages (DSLs) that are used to model services: Service Contract Model, Data Contract Model, and the Host Model. The Service Contract Model is illustrated in the following screenshot.
A community site is available at CodePlex, the site contains hands-on labs, demonstration videos, issues and roadmap information.