...that allows you to have the rendering and javascript engines of IE8,7,6 and 5.5 on Windows 7,Vista and XP,as well as the installed IE in the same process.

http://www.my-debugbar.com/wiki/IETester/HomePage

Looks interesting but i dont wanna install over 90 files just to look at this!! (Someone said it installed a little over 90 files with one language)