[couradical]

Running headless virtualization on a server with KVM?

Sure, for a desktop system it might make sense, but headless systems might be better served with QEMU-KVM.

[uulbiy]

Actually you can run virtualbox in a headless server using the VBoxManage and VBoxHeadless[1]. I have been using that for years.

[1]: http://www.virtualbox.org/manual/ch07.html