olha só: http://blogs.msdn.com/ie/archive/2005/10/12/480242.aspx

pelo q entendi, eles recomendam não usar hacks para IE:

Call to action: Please check your pages

Here is a list of common CSS hacks to look out for (please also consider their variations):

* html > body – http://css-discuss.incutio.com/?page=ChildHack
* * html – http://css-discuss.incutio.com/?page=StarHtmlHack
* head:first-child + body – http://centricle.com/ref/css/filters/tests/owen/
* head + body – http://www.dithered.com/css_filters/css_only/head_adjacent_sibling_body.html
* body > element – http://css-discuss.incutio.com/?page=ChildHack

We ask that you please update your pages to not use these CSS hacks. If you want to target IE or bypass IE, you can use conditional comments .