ZDNet: Article with Dan Chu of VMWare (external link) This video clip is about 4 minutes in length and gives a general overview of what virtualization is.

Virtualization 101 (external link) 9 minute video from CyGem06? on YouTube?.

Microsoft: Windows Server 2008 - Keith Combs (external link) This video is 11:26 in length and describes Microsofts Windows Server 2008 virtualization solution. Note: it only supports virtualization of Microsoft's products, and at the time of this video it's still BETA code.

InfoWorld: Definition of Virtualization (external link) This video is less than 3 minutes and gives a brief overview without any specific vendor bias. It describes Para-Virtualization, OS Virtualization, and Hardware-based Virtualization.

Sun: Virtualization video demonstrating SUN's solution (external link)

SLES XEN virtualization demonstration part1 (external link)
SLES XEN virtualization demonstration part2 (external link)

A little comedy goes a long way: Old School VS VMware (external link)

Novell and AMD have partnered in delivering Virtualization platforms (external link) for your enterprise. This is a 20 minute video conference.