I know I personally want OS X virtualization as there are a number
of server applications that have limits to them, at which point a
new instance needs to be spun up (FileMaker in my case,
specifically). There is no way to run multiple instances of said
applications on one OS install - it requires a separate OS install
per application because of the inability to change ports to serve
on, etc.
I know some folks will be tempted to say "don't use those
applications then", but that is not a solution.
You know FMP is the cr@pplication that I always use as*the* prime
candidate for moving to another box. Unfortunately it's problems are
I/O related and when it blows out it is just as likely to take down
the whole hypervisor in this case since it's the hw that seems to be
the underlying spot where it fails. XServe RAIDs would be especially
effected.
As for the other port issues, yeah those are a bear too.