One of the main reasons for most of my recent travels and projects is virtualization. Many clients are going the virtual way to save costs on energy, space and cooling, plus it lets them get the most out of their existing hardware. But many VMWare implementations I have seen are your typical next > next > next .... reboot, very few people take the time to secure their VMware ESX infrastructure and that is when I recomend to them to get started a great little pice of freeware called Configcheck from Tripwire. The only thing missing in it is report generation in a PDF or HTML format but other than that if you have a VMWare ESX 3.x infrastructre use this great tool to give it a quick check.