The sad truth is that it’s becoming more and more important to cross test your markup on multiple browsers including Internet Explorer. Yes I’ve heard the announcement about IE6 being dead, but chances are you probably need multiple browsers, and graceful degradation / progressive enhancement should still be the ultimate goal for any web designer.
VirtualBox to the rescue
VirtualBox is a fantastic virtualization tool for Mac OS X, Windows, Linux and Solaris. I actually like it more than Parallels, and unlike Parallels, it’s free. Setting up a virtual machine is pretty easy, but it’s a bit time consuming. Once you have a VM set up there doesn’t appear to be any quick way to duplicate the already working image. This tutorial will guide you through the steps needed to duplicate a VirtualBox image on Mac OS X.