If you're into computer virtualization, you should probably be familiar with OVF.
The "Open Virtualization Format" is a supposed standard for interchanging VMs between vendors (VMware, Microsoft, VirtualBox etc.) Here's a good overview of the format :
Most of my experience with virtualization has been with VMware, Xen, Virtual PC and recently with VirtualBox on the desktop.
I wanted to see how OVF might work, so I found this minimal OVF version of Solaris :