Let's face it. Although I'm no designer, I do feel sorry for my fellow colleagues when I hear them complain about the rendering on some specific browser(s).
It gets harder when testing against IE6 for example. They normally use IE6 VMs to perform testing. There are three major drawbacks of this approach:
1: WHERE IS THE IE6 VM? Is it on the local machine? Is it on the network? Is it on a Virtual Server that no one has admin rights to? Does the IE6 VM have a meaningful name .. Imagine having 10 VMs locally and having to boot each one to see if IE6 is present !!
2: Loss of password for Logging into VM. (just because the last person who logged in just decided to change the "usual" password to his/her cat's name and not telling anyone about it..and he/she is most propbably off sick when we need to do testing)
3: VM gets copied across network onto physical machine. Transfering 6-10 GB to your computer and hosting the VM locally. Another designer comes along and does the same thing. We now have 2 VMs on 2 different machines that serve the same purpose. Let's not entertain the idea of having both VMs running simultaneously !! A whole range of IP Address/Name resolution conflicts arise. :)
Microsoft Expression Web SuperPreview for Windows Internet Explorer
This tool allows us to view a page in different IE versions. This eliminates the use of glorious VMs for testing. Well done Microsoft !
You can download Microsoft Expression Web SuperPreview for Windows Internet Explorer here
"Expression Web SuperPreview for Internet Explorer is a stand-alone visual debugging tool that makes it faster and easier to migrate your sites from Internet Explorer 6 to Internet Explorer 7 or 8. With Expression Web SuperPreview for Internet Explorer, you can ensure that your Web sites work correctly in Internet Explorer 8 while also maintaining compatibility with earlier versions of Internet Explorer.
Expression Web SuperPreview for Internet Explorer shows your web pages rendered in Internet Explorer 6 and either Internet Explorer 7 or Internet Explorer 8, 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.
Expression Web SuperPreview for Internet Explorer not only shows a high-fidelity rendering of how pages will look on different browsers, but it also identifies the element's tag, size and position, applied styles, and location in the DOM (Document Object Model) tree so you can quickly fix the error. "
Expression Web SuperPreview for Internet Explorer is a standalone, free application with no expiration and no technical support from Microsoft.
If you wish to have the ability to debug pages both in IE and Firefox flavours in a single application, go for Microsoft Expression Web. You can download a 60-day trial copy here