My reply to the post "On the dangers of OHV" at : http://virtualization.com/guest-posts/2009/04/17/on-the-dangers-of-ovf/ from Kris Buytaert :
I would like to suggest to try out openQRM. That way you can perfectly separate "hardware" (virtual or phyiscal) from "software" (your server-images). With openQRM you are completely independent from any virtual disk-image format. Server-images in openQRM are "just" root-filesystems and you can deploy them to virtual machines of any type and also transparently migrate them to other virtualization technologies and even to physical machines at any time without touching or changing your server-image in any way.
.. just my 2 cents, i can perfectly live without OVF