Future-proof your CSS with Conditional Comments
I guess the rule will soon be that with each new version of IE, you'll have to add another, separate CSS file tailored specifically to correcting its various wonkeries and gotchas along with another file full of code to correct the bugs that effect of all versions of IE. Gross.
But, I suppose, at least folks like Bruce Lawson make accessing those various files easy by providing nice write ups on how to do just that: Future-proof your CSS with Conditional Comments.