For an interesting cross-post from IBM DeveloperWorks, check out a recent post over in the Virtualization@IBM blog where Jean Staten Healy and others talk about KVM and Linux.
Many people many not realize how well security, simplicity, and common usage is baked into both Linux and KVM. KVM is both stable implementation and a technology in progress in the community. As the blog article points out:
Want to learn more about KVM? Check out IBM's KVM page, read the "KVM Overview" and the "Why KVM?" sections!