It is a pain to check your web design in all the versions of IE in your computer as your PC won’t allow you to install multiple versions of IE. Most of the time designs will break in lower versions of IE, that it is a whole different story. IEtester is a free tool that allows you to test web sites in different versions of IE including IE8 beta 1, IE7, IE6 and IE5.5.
Another way to test is using browsershots, but sometime you end up in queue for long. via Ajaxian
See the video of IETester:
ScreenCast IETester from WebInventif.fr on Vimeo.
Ram,
This is a really handy plugin, and it works well.
Another handy plugin that lets you view websites in different screen resolutions is
Windows Resizer:).
Regards.
I like Browsershot.
Its excellent, but sometimes slow.