Plone is starting to be used internally by quite a few large corporations and government agencies. One of these agencies, Hawaii E-Government Initiative was kind enough to give back to the community - a internal video presentation.
Thanks to the e-govt team. This presentation is exactly what Plone needs at the moment. Its very eloquent and explains what Plone does and why you would want to use it. Its very high level and targets decision makers. These files require Windows Media Player. "low bandwidth":http://olepe.icsd.hawaii.gov/dags/icsd/content/video/higovdemo_056k.asf "high bandwidth":http://olepe.icsd.hawaii.gov/dags/icsd/content/video/higovdemo_250k.asf