Composite Application Guidance for WPF 2008 Release Candidate 1 has been released and is available for download.

Per the CodePlex site:
"The Composite Application Guidance for WPF is designed to help you more easily build enterprise-level Windows Presentation Foundation (WPF) client applications. This guidance will help you design and build flexible composite WPF client applications – applications that use loosely coupled, independently evolvable pieces that work together within the overall application.
This release is the first release of composite application guidance for WPF; based on your feedback, this guidance will evolve in future releases. It is marked as a release candidate as its final destintation is MSDN scheduled within a couple weeks. We don't expect the content to change before going to MSDN."
After you download the Composite Application Guidance for WPF, you will find the complete source of the Composite Application Library as well as several quickstarts:
- Commanding
- Event Aggregation
- Hello World
- Modularity
- UI Composition
It also comes with the StockTrader Reference Implementation that uses Unity IoC for Dependency Injection as well as a sparse amount of the Enterprise Library Logging Application Block and Exception Handling Block for infrastrucutre services.
If you are familiar with the Smart Client Software Factory and Web Client Software Factory, you will see a few similarities that are shared across all these tools that build Composite Line of Business Applications as well as few differences that you will easily enough adjust to.
Although the Composite Application Guidance for WPF is marked as a release candidate, it is apparently not expected to change before the actual release.
You can download it here.