When trying to test across multiple versions of Internet Explorer (6, 7, 8) I have in the past used the Virtual PC Console and mounted VHDs available from Microsoft. I am ru
Microsoft is releasing "Platform Previews" of IE9 that can be installed side-by-side with IE8 on Windows Vista and Windows 7, so there's no need to use a virtual machine. http://ie.microsoft.com/testdrive/