When you have Chinese Characters(double-bytes) on page, IE and FF displays line-height differently. IE slightly shifts the characters upwards. When you have an icon to be displayed along with the text, the icon may appear a little off in the other browser. This wasn't an issue since we could use IE hack to adjust the icon positions. However, with IE8 coming, claiming to "behave just like any other standard browsers", we now lose the chance to modify for it. This could be a problem.
SOLUTION: If this really bothers you, (or your VD), assign a double-byte font-family for it then - in this case, PMingLiu