Now you can debug your pages on multiple versions of IE on the same machine that you use for Web development. Expression Web SuperPreview for Windows Internet Explorer is a stand-alone visual debugging tool that shows your web pages rendered in IE6 and either IE7 or IE8, depending on which version you have installed on your machine. You can view the pages side by side or as an onion-skin overlay and use rulers, guides and zoom/pan tools to precisely identify differences in layout. You can even compare your page comp to how the targeted browsers render the page, announces edm.
Download: Expression Web SuperPreview