http://kb.vmware.com/kb/2021202 - This video provides best practice information on performing and implementing a new installation of VMware vCenter Server 5.1.
In the video you will find more information on the new vCenter Single Sign On feature.
For additional information relating to topics such as the vCenter Server Inventory Service and the hardware requirements for the various components within the vCenter Server 5.1 software bundle, check out VMware Knowledge Base article "Installing vCenter Server 5.1 best practices(2021202)" at http://kb.vmware.com/kb/2021202
Note: For best viewings results, ensure that the 720p quality setting is selected an view using full screen mode.