When Mondrian, Kettle and JFreeReport signed up with Pentaho, the Pentaho team committed to helping their communities grow the projects. One way that we feel we can contribute to these projects is to provide a robust set of development tools for the project's communities. Project forums are core to facilitating a community in their collaborative efforts, so it became our top priority to provide stellar forum services for all of the Pentaho projects.
Throughout the planning for integrating our project forums, we have been focused on balancing two sets of needs: if you only are interested in one Pentaho project, it's easy to get to it and you can work with a focused community while providing a consistent experience and an easy way for the many multi-project users and contributors to have access to a common set of resources and interact with the rest of the community. With vBulletin, you have the flexibility to narrowly focus on the project of your choice (for example, search only the Kettle forums), or collaborate across all Pentaho forums, in one location!