There is now a solution accelerator for Hyper-V security…something all of you should in interested in :-)
The Hyper-V Security Guide can help you elevate the security of virtualized Microsoft® Windows Server® environments to meet your business-critical needs. This guide provides IT professionals like you with guidance, instructions, and recommendations to address your key security concerns around server virtualization.
Sign-up to the beta here,
Full details on the Virtualization team Blog: http://blogs.technet.com/virtualization/archive/2009/02/06/Windows-Server-2008-Hyper_2D00_V-Security-Guide-_1320_-beta-now-available.aspx