Rather inadequately, I have explained the difference between a CMS website and a conventional website as a matter of who contributes content, a CMS encourages wider participation in the website creation process. But that understates the significance of collaboration and networking. For example one site featured at the recent DrupalCon in DC was OAN. It is just difficult to imagine Dreamweaver in the driver's seat.
Tom Arah came to my rescue with this article. It is not the form, nor the flash, nor even the content. It's the connections.