After a rapid slew of public betas, VirtualBox 4.0 was released on December 22 last year - just in time for the holidays. It was introduced with a revamped GUI as well as additional functionality. You can view the changelog here for details. I won't go into the details of the new version but I'd like to point out a few things that I experiened with this new version. One of the features I love about VirtualBox is the ability to move a virtual machines between different hosts using the export/import appliance wizard. The export creates a set of virtual disks along with an Open Virtualization Format (OVF) file that describes the appliance's configuration. You can then copy these files to an external device such as USB disks or make them available via a web/ftp server. To import appliance you simply specify the location of the OVF file and follow the steps in the wizard. You can also use the VBoxManage commands to export/import. Oracle Technology ...