As described on EDGE, System Center Virtual Machine Manager (SCVMM) released to manufacture(RTM) this week which is going to be another huge step for making Virtualization more common place in the enterprise.
One of the key issues that ITPROs told us, was there was no really great solution for managing the potentially 1000's of virtual servers in the environment. SCVMM solves this problem, with an integrated, multi-vendor solution to manage your virtual environments, including Virtual Server, Hyper-V and VMware ESX.
SCVMM 2008 also includes a new feature, "Performance and Resource Optimization (PRO)" which enables customers to dynamically manage the performance of their virtual hosts and guests.
Key things to be aware of
You can download an eval of the software at the following location ( evaluation copy )