One of new distinct features that you will find within Oracle VM Manager 2.2 is the ability to prioritize your CPU usage across your different VMs running within your Oracle VM host. Instead of writing an article on the new feature set, I found a great oracle vm blog article written by Honglin Su that describes just that. A link to the blog can be found at http://blogs.oracle.com/virtualization/2009/10/oracle_vm_22_new_feature_cpu_s.html