quick one:
<link rel="stylesheet" href="www.domain.com/css.css" type="text/css" />
<!--[if lte IE 6]><style type="text/css" media="all">@import "www.domain.com/ie6.css";</style><![endif]-->
<!--[if gt IE 6]><style type="text/css" media="all">@import "www.domain.com/ie7.css";</style><![endif]-->
put this is your header if there is small differences in IE and you need to change up margins etc.
you dont need an entire new style sheet for each new called in css file, you only need to replace the div that are different for ie and ie will read it.
