The best way to use multiple versions of IE on one machine is via virtualization. Microsoft has recently made Virtual PC 2004 a free download; we’ve taken advantage of that by releasing a VPC virtual machine image containing a pre-activated Windows XP SP2, IE6 and the IE7 Readiness Toolkit to help facilitate your testing and development. The image is time bombed and will no longer function after April 1, 2007. We hope to continue to provide these images in the future as a service to web developers.
Excellent, and surprising news. It seems like the IE team really do care about us web developers. Cheers guys!