"Product and Marketing Requirements Planning" is one of the Fantastic 40 SharePoint Templates. It provides a basic site template and a couple key Word document templates that appear to be built off the
Blackblot PMTK methodology. These Word templates are great for creating a Marketing or Product Requirements Document (MRD or PRD) for final approval. However, there is a lot of collaboration that leads up to the creation of those documents regarding which features are going into the products and why.
SharePoint lists provide a nice way to collaborate on that information for both the marketing and product requirements, and the two lists can be linked via a lookup. This template implements the core requirement lists and provides a document library for the Word templates that come with the F40 template from Microsoft.