Last week, Microsoft made available a free management pack for download for server virtualization software. Note you still need to have MOM 2005 running already.
The pack helps keep tabs on computers running the software and the virtual machines hosted by the software.
The Microsoft Virtual Server 2005 R2 Management Pack can run on Virtual Server 2005 and on Virtual Server 2005 R2. Microsoft said the management pack provides monitoring and reporting capabilities. Follow the download link for more information on the capabilities.