Virtual Servers, Redux

So, VMWare is installed and chugging along fine. We pushed our webserver to a virtual machine about two weeks ago, and haven't had any problems. A dual processor, quad core 2.0 gHz machine with 8 GB ram is pushing three low-traffic boxes as well as that web server, and still maintaining <20%>10 virtual machines) I'd say TCO is lower on the Microsoft side. Otherwise, ESX it is...