With 20 million total downloads and some 40,000 downloads per day, Sun VirtualBox has become a major, general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is now the only professional-quality virtualization solution that is also Open Source Software. A significant new release, VirtualBox 3.1, improves performance and adds significant new features, including 'teleportation' which is the live migration of a VM session from one host to another (e.g. from an Intel-based Mac Desktop to an AMD server then to an Intel-based laptop running Windows 7).
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