Mark Russinovich recently gave a TechNet Talk on Cloud Security and Ethical Hacking. Short talk, but great answers to questions that I am sure we have asked ourselves or just wanted to know the answer to.

http://blogs.technet.com/b/uktechnet/archive/2014/11/13/technet-talks-mark-russinovich-on-cloud-security-and-ethical-hacking.aspx