Here http://www.gss.co.uk/news/?&id=5098 is an interesting article about the difference between PCI compliance and security. The point of the article is that purchasing compliant products doesn’t necessarily make you secure. This reminds me of a related point: that much of compliance is about human processes and procedures. Even if your equipment is compliant, you still need to follow procedures (such an approval process for requests to change firewall rules). If you ignore the human side, your compliance and security will be compromised.