IETester

We recently heard of a product, IETester, a free browser that allows you to have the rendering and javascript engines of IE8 beta 1, IE7 IE 6 and IE5.5 on Vista and XP.

The software may be unstable because it is only an alpha release.

Find out more by checking out http://www.my-debugbar.com/wiki/IETester/HomePage

There is another emulator at http://www.browsrcamp.com. It is not a full emulator but produces Safari results in a manner like screenshot.