Any developer that has worked on web interfaces knows the pains involved in dealing with different browsers and browser versions.  Microsoft  has notoriously made this difficult by not permitting more than one version of IE to run on a machine.  The solution – install a VM for each version of IE you want to run.  Does that sound crazy to you?  It does to me.

I recommend using one of the following tools to accomplish the same thing:

1. http://spoon.net/browsers/ – My first recommendation.
2. http://www.my-debugbar.com/wiki/IETester/HomePage – Seems to work pretty well.

I have to test things on different browser versions regularly due to my work on DWR and both of these tools have been a tremendous help.