Are you saying a VMM to virtualize other software or a pre-configured VM containing OpenBSD you can run on top of other OS's with better hardware support? Or something else entirely?
A VM to virtualize other software. In this case, my desktop has to support some clients who have very specific VM images of Win7 to access them. VirtualBox and VMware are fine, but for QEMU it's just way too slow (for me, at the moment)