the conditionals only work for IE (I can't find anywhere that would suggest different). The way I work this out is to develop for FF/Safari/Opera. Then make it work in IE. Those three seem to work better with standard code. IE really needs the shims to get everything to look correct. And these three cover the basic html render engines. These same rules apply for JavaScript too..

here is a link for the conditionals..
http://www.dedestruct.com/2008/04/03...onal-comments/