I have previously been using VirtualBox on an Ubuntu installation, but have now switched to openSUSE 11.4. I have a .vdi file that I want to continue using and would like to know if it is possible to import this to the (preferred?) hypervisor which appears in the openSUSE System menu, which I assume is XEN.

Never having used XEN, I would also appreciate any thoughts on the comparative merits of the two applications.