Sure, use conditional comments:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
<title>Untitled Document</title>
</head>
<body>
<p>
Everyone can see this
</p>
<!--[if IE 7]>
<p>
Only IE7 users can see this
<br>
That's right
</p>
<![endif]-->
</body>
</html>
These are especially useful when you need different styles for IE, you can then put a link to a stylesheet between the conditional comments. Take a look at this article for more info:
http://msdn.microsoft.com/en-us/library/ms537512.aspx (http://msdn.microsoft.com/en-us/library/ms537512.aspx)
Good luck!