Red Hat has made a freely available beta of their forthcoming KVM-based virtualization package, Red Hat Enterprise Virtualization 3.0. The first beta was previously available this summer, but now they're making it available to the community and non-RHEL customers.
"Red Hat Enterprise Virtualization 3.0 offers a balance of enterprise virtualization management features, performance and scalability for Linux and Windows workloads at a significantly lower cost than the alternatives. It is based on the Kernel-based Virtual Machine (KVM) hypervisor, which brings to the solution the strong performance evidenced in recent leading SPECvirt benchmarks and the security it inherits from the Linux kernel. KVM benefits from the expanding presence of the Open Virtualization Alliance, a consortium established by Red Hat and other industry leaders to foster the adoption of open virtualization alternatives, such as KVM," says the Red Hat press release
Red Hat's virtualization management technologies are available as open-source via the oVirt project
Some notes about Red Hat Enterprise Virtualization 3.0 include its manager being a Java application running on JBoss Enterprise Application Platform atop Red Hat Enterprise Linux, a RESTful configuration API, multi-level administrative capabilities, SPICE WAN optimizations, support for transparent huge pages, and much more.