Menno te Koppele's blog called my attention to this: "Microsoft Dynamics CRM 4.0 is officially supported to run on a computer that is running Microsoft Virtual Server 2005 in production systems.". You can read Menno's post here and Microsoft's related KB here.
This is great because I'm actually deploying my MS CRM Dynamics 4.0 development environment on a Virtual Server 2005 and I want to follow this approach for my production environment.
However be aware of the following "Microsoft does not test or support Microsoft software on a computer that is running non-Microsoft hardware virtualization software. ".