Looks tempting. I wonder exactly what level of support they have included for “Mac OS X guests”? It would be nice (but possibly illegal) if OS X guests were supported under Windows 
VirtualBox 3.2 Beta – New Features and Re-Branding | Architects Zone
All references to VirtualBox have been changed to ‘Oracle VirtualBox’ by Oracle with no impact to compatibility they say. Some of the most significant new features are considered “bleeding-edge,” like the experimental support for Mac OS X guests. Another cool feature is Memory Ballooning. This allows a Virtual Machine to dynamically increase or decrease the amount of RAM that it uses. This feature works only in 64-bit hosts.OVB 3.2 also has new CPU hot-plugging features [ but only on Linux and Windows, Ed. ]
