I am working on convincing "managament" of a large non-profit organization to use Drupal for their next project. They are very open - just need the benefits explained. I need to make a presentation on why Open Source vs an ASP or (gulp) client-server install will better suit their youth-oriented Web 2.0 web project (multimedia, social networking etc). While the benefits seem obvious to me, I am having trouble articulating it and would love to know if any of you have any Powerpoints or memos you'd be willing to share. I'd be more than happy to give what I create back to the community.