I have recently published an article that I hope will help customers make a well informed decision when evaluating how best to virtualize Oracle workloads on vSphere. The article will help customers determine fact from fiction, and help to remove the FUD that generally comes from some professionals around Oracle virtualization. If you like this article I'm sure you'll like my Oracle sessions at VMworld (APP-BCA1432 and APP-BCA1624).
http://longwhiteclouds.com/2012/07/21/fight-the-fud-oracle-licensing-and-support-on-vmware-vsphere/