I'm new to VMware products and am trying to get oriented with the terminology and tools. Can someone define the following and talk about how they fit together? Is there a good intro document that describes the overall VMware landscape?
VSphere - is a hypervisor which allows users to install multiple virtual machine instances running different (or same) operating systems.
vCenter - is a product that can be used to manage and administer multiple vsphere hosts
vCloud - take a look at http://en.wikipedia.org/wiki/VCloud for a better definition than i could give
vCloud Director - http://www.yellow-bricks.com/2010/08/31/vmware-vcloud-director-vcd/