Just downloaded NS4.8--all 17.3MB of it--for testing, and I can't seem to get it to use <link>ed stylesheets at all. It'll "work" (as much as can be expected) with styles declared inside the page, itself, but not when I link to it. Even SitePoint has problems--can't seem to figure this one out.
And I really don't want to d/l it again! :-p