Pentaho Pre Sales director Michael Tarallo and some of his collegues set up a showcase webpage for Pentaho BI Stack.
The Pentaho BI showcase is a resource that should streamline the effectiveness of the Evaluation/Selection process of Pentaho for your BI project.
You can download additional examples, presentations and documents from there. In addition there are a lot of screencasts demonstrating important features of the plattform toolset and something like a quickstart guide showing you how to quickly set up a platform for your own evaluation process.
The Pentaho BI showcase website is: