Would you need to change anything if that line height were set in ems or % though? Whatever you changed the font size to would be automatically reflected in the line height, wouldn’t it? (Granted, though, that it’s a different story for descendent elements, as the Eric Meyer link above shows, so I still don’t like the idea of setting units on line height.)
Anyhow, here’s one of the discussions by said member about line height: Layout Disaster! (CSS) - #36 by system, in case anyone’s interested in what we are referring to!