Stu Radnidge and Shyam Madhavan over at vinternals.com have put together an interesting tool, now at v1.1. Link: Tool: Statelesx | virtualization.info.
This tool allows the VMware administrators to define a configuration
file on a web interface (including details about the virtual
networking, the DRS, the HA, etc.) and associate it to a certain ESX by
the host name. ..
The whole thing, working with VMware
Infrastructure 3.5 only, cuts away the need to configure a new ESX on
deployment and backup its configuration over time. But most of all it
avoids inconsistencies across the virtual infrastructure: