InfoWorld has published it's opinions on this year's best technologies, and Sun's VirtualBox 3.1 is one. They find it to be a compelling high performance, cross-platform virtualization software alternative to VMware Workstation, noting that VirtualBox definitely supersedes this competitor in scalability.
VirtualBox 3.x supports up to 32 virtual CPUs per VM, while VMware Workstation supports just 4. "Add to this improved snapshot capabilities and 2-D acceleration for virtualized applications, and you have a solution nipping at VMware's heels in the general desktop virtualization space," writes InfoWorld's Randall C. Kennedy.
Another feature highlighted is VirtualBox's teleportation capability. The command-line function allows users to use a simple syntax to move a VM running under VirtualBox on one system and "teleport" it to another VirtualBox system, all the while preserving the VM's runtime state.
The most remarkable feature of VirtualBox is the speed with which it has developed into a real competitor in the desktop virtualization market. "In a little over a year, Sun has turned this relatively unknown fledgling from an obscure German software developer (Innotek) into a potent threat," observes Kennedy. "Our advice to VMware (and Microsoft): Be afraid. Be very afraid."
InfoWorld article: http://www.infoworld.com/print/105458