NetFlow usage on ESX / vSphere Environment

I came across with few articles and official documentation on using NetFlow on Virtual Switches and vDS.

For using NetFlow on vSwitch/es look at this guide

http://www.vmware.com/resources/techresources/1014

Configuring NetFlow on ESXi 5.0 is described here.

There is a Evaluator's Guide also available for vSphere 5.0

For vDS Best Practice Venky @VMWNetworking (from VMware) has nicely explained here.