Have you ever needed to verify the security or hardened state of you ESX hosts?

If yes, then these tools from ConfigureSoft.com or TripWire.com will help you make the process easier.
If no, take a look at the tools anyway – it’s always nice to know if your “babies” are safe ;-).

http://www.configuresoft.com/compliance-checker.aspx
Compliance Checker for VMware ESX, checks the compliance of VMware ESX hosts against VMware hardening guidelines and Center for Internet Security (CIS) benchmarks.

Compliance Checker for PCI DSS, checks the compliance of servers and desktops against PCI DSS v1.2 requirements as specified by PCI Security Standards Council.

TripWire ConfigCheck

http://tripwire.com/configcheck/download.cfm
Read a great how to.
http://searchvmware.techtarget.com/tip/0,289483,sid179_gci1344980,00.html