KVM Is The Feather In Red Hat Enterprise Linux 54

Red Hat has released RHEL 5.4, a major point update of its commercial Linux distribution.

This version introduces support for KVM, a significant milestone in Red Hat's evolving virtualization strategy.

Source:
http://arstechnica.com/open-source/news/2009/09/red-hat-moves-forward-with-kvm-virtualization-in-rhel-54.ars