Do you need to build a big old WPF or Silverlight line-of-business application? Is it so big that you need to partition the work among several dev teams? Then you need Composite Application Guidance (CAG) for WPF.
The Patterns and Practices folks have rebuilt the popular CAB package into Composite Application Guidance for WPF, formerly known as "Prism".
Download Drop 3 of the CAG package from here. Visual Studio integration is in the house -- be sure to check out Max Knor's post on Using the VS Templates for Composite-WPF-Guidance.
The new drop includes:
The Stock Trader RI application that ships with CAG, with regions indicated.