New videos on TechNet Edge:

Virtual Machine Manager 2008: http://edge.technet.com/Media/Virtualization-Launch/

Microsoft Hyper-V Server 2008 :http://edge.technet.com/Media/First-Look-Hyper-V-Server/

Microsoft Windows Server 2008 R2 Live Migration : http://edge.technet.com/Media/Demo-Hyper-V-Server-and-Live-Migration/