Texiwill just published a blog post about this http://www.virtualizationpractice.com/defense-in-depth-firewalls-within-virtual-environment-16560/
You can hear the podcast in this video while watching a sight seeing trip by boat in Copenhagen.
http://www.virtualizationpractice.com/defense-in-depth-firewalls-within-virtu...
http://www.virtualizationpractice.com/resources/virtualization-security-podcast/
http://www.talkshoe.com/talkshoe/web/talkCast.jsp?masterId=34217&cmd=t