In a Xen blog entry some days ago I just read about the Open-OVF Format initiative.

Would be cool to also include Virtualbox (or, if Sun would also implement support for such a format in virtualbox), as here it's still a major pain to package and distribute VM's for others - and there, on the desktop market, it is even much more important to make sharing easier than on the server.

For Xen I see, having support for such a format in the OpenSource version, an a nice and easy to use Desktop GUI, well working ACPI support - Xen could really get a grip on the Desktop/Workstation virtualization market...