Most of our networking/programming classes use PCs with Windows. Our current virtualization solution is VPC and MS Virtual Server.

That being said, I tried VMWS today and was extremely impressed. I picked up both Linux and Windows versions plus enough serial #s so that my fellow instructors can mess around with it.

When and if I get a Macintel box (and so far they look highly droolworthy) I'd like to use Parallels.