The documentation of the
Prism v2 - Drop 10 includes the following topic to help Composite UI Application
Block developers familiarize themselves with the Composite Application Library, by comparing the main components of both libraries. Perhaps you could find it useful.
Upgrading from the Composite UI Application Block
The documentation also includes an article that provides guidance to choose a P&P deliverable for building composite applications:
Overview | Guidelines for Choosing Composite UI Deliverables from patterns & practices
If you do not want to download the latest drop of Prism v2, you can browse online the previous version of these topics (that target the
Composite Application Guidance for WPF - June 2008 release):
Composite Application Guidance for CAB Developers
Guidelines for Choosing Composite UI Deliverables from patterns & practices
Please let me know if this helps.