Here is the basic technique for an IE-Only stylesheet:

<!--[if IE]>
	<link rel="stylesheet" type="text/css" href="ie-only.css" />
<![endif]-->

The opposite technique, targeting only NON-IE browsers:

<!--[if !IE]>
	<link rel="stylesheet" type="text/css" href="not-ie.css" />
<![endif]-->

If you need to get down and dirty with specific versions of IE, here are a few examples.

IE 7 ONLY:

<!--[if IE 7]>
	<link href="IE-7-SPECIFIC.css" rel="stylesheet" type="text/css">
<![endif]-->

IE 6 ONLY:

<!--[if IE 6]>
	<link rel="stylesheet" type="text/css" href="IE-6-SPECIFIC.css" />
<![endif]-->

IE 5 ONLY:

<!--[if IE 5]>
	<link rel="stylesheet" type="text/css" href="IE-5-SPECIFIC.css" />
<![endif]-->

IE 5.5 ONLY:

<!--[if IE 5.5000]>
<link rel="stylesheet" type="text/css" href="IE-55-SPECIFIC.css" />
<![endif]-->

VERSION OF IE VERSION 6 OR LOWER: (I find this one pretty handy)

<!--[if lt IE 7]>
	<link rel="stylesheet" type="text/css" href="IE-6-OR-LOWER-SPECIFIC.css" />
<![endif]-->

http://css-tricks.com/how-to-create-an-ie-only-stylesheet/

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