AD RMS/IRM Help for New Users

I write for a developer/IT pro audience, but I regularly have people ask me about documentation for end users (typically a knowledge worker trying to figure out how to protect documents with Word or Outlook). I usually refer people to Information Rights Management in the 2007 Microsoft Office system. This page provides a quick and thorough explanation of how IRM works, and contains a couple nice step-by-steps to get you started.