IETester is a free WebBrowser that allows you to have the rendering and javascript engines of IE8 beta 2, IE7 IE 6 and IE5.5 on Vista and XP, as well as the installed IE in the same process.
New in v0.2.3 : IE8 beta 2 and Print feature !
This is an alpha release, so feel free to post comments/bugs on the IETester forum or contact me directly.
Minimum requirement : Windows Vista or Windows XP with IE7 (Windows XP with IE6 has some minor problems and IE7/IE8 instances do not work under this config)
Download IETester v0.2.3 (24MB)
source: http://www.my-debugbar.com/wiki/IETester/HomePage