For anyone that is at VMworld you have heard of the datacenter that has been put together to support VMworld operations and labs.
For those that are not aware, there is a total of 512 Cisco UCS blades utilizing a unified fabric of Cisco MDS and Nexus 7000 gear including literally tons of storage from EMC and NetApp. Capable of taking on tens of thousands of VM’s and many many terabytes of storage.  

37,248 Virtual machines on 776 Physical Servers

Cut power from 25Megawatts to 540 Kilowatts by virtualizing

Here is a short take of the implementation..