Just wanted to give everyone some links to more information about Conditional Comments in IE. These allow you to further tweak your CSS for IE 5.0, 5.5, 6.0 etc without hacks if your specific CSS is not working properly in those browsers. The whitepaper shows a sample but these links give you some additional info.
For example:
<link href="StyleSheet.css" rel="stylesheet" type="text/css" title="default" />
<link href="StyleSheetPrint.css" rel="stylesheet" type="text/css" media="print" />
<!--[if IE 5.0]>
<link href="StyleSheet-IE50.css" rel="stylesheet" type="text/css" title="IE50" />
<![endif]-->
<!--[if IE 5.5]>
<link href="StyleSheet-IE55.css" rel="stylesheet" type="text/css" title="IE55" />
<![endif]-->
<!--[if IE 6.0]>
<link href="StyleSheet-IE60.css" rel="stylesheet" type="text/css" title="IE60" />
<![endif]-->
MSDN - About Conditional Comments
http://msdn.microsoft.com/library/default.asp?url=/workshop/author/dhtml/overview/ccomment_ovw.asp
Hack-free CSS for IE
http://virtuelvis.com/archives/2004/02/css-ie-only
Also if your testing your website with the 'Standalone' IE browsers, they all report the main version of IE you have installed on your system in Conditional Comments. For example, on my system I have IE6.0 installed, so when I test with the Standalone IE5.0 the Conditional Comment runs for IE6.0 anyways. To test I just change the version numbers in the comments temporarily to my current IE version then switch them back when i'm done.
Below is a website that has an archive of standalone browsers for testing.
http://browsers.evolt.org/
Best Wishes,
Paul