Finally there’s really good open source alternatives for virtualization management. Yesterday oVirt-project made announcement:
The oVirt project today announced that Canonical, Cisco, IBM, Intel, NetApp, Red Hat and SUSE have joined together to help create a new open source community for the development of open virtualization platforms, including virtual management tools to manage the Kernel-based Virtual Machine (KVM) hypervisor. With the oVirt project, the industry gains an open source, openly governed virtualization stack.
What this means actually is that Red Hat finally open sourced their RHEV-M and RHEV-H. While we need to wait while for official release (Jan, 2012) you can start testing it today.