A good, 7 page primer for Lotus Professionals on the broad 'Document Management' market has been produced by Lotus Domino Document Manager Redbook co-author Femke Goedhart (Silverside) for TheView.

The article summary by Femke:
My aim is to provide you with an overview of document management concepts and products — from the very simple to the very complex — and a categorization system for understanding the types of products available and how you can use them to meet your specific requirements. Whether you are new to the document management market or a seasoned administrator, understanding what document management is all about should prove to be a real asset in your search for a solution.