Check out this video taken during the Orange County VMUG meeting recently.  While a bit longer than most videos on here, this is a highly edited version of the VKernel presentation... still, it comes in at about 15 minutes in length, but it is good and valuable information. 

The video presentation covers the three main causes of escalating costs in virtual environments, talking about sprawl, overallocation of resources and choosing the right or wrong hardware for your environment.

And the speaker is none other than Bryan Semple, CMO of VKernel.