I use @import instead of link as the most buggy browsers (Netscape 4 for instance) don't understand the import statement and therefore won't use the css (and screw the layout).
This being said, as NE4 market share is probably very close to 0, I doubt this trick is very useful anymore. Legacy habit I suppose.
P.S. Seen your modifications on ezenhancedobjectrelations: congrat !
Ah so that's why it looks entirely unstyled in NS4. Personally, I stopped giving a shit for NS4 users (same for IE4, both are well below 1% market share). Half the web doesn't look anywhere right to them anyway, so why should I spend double the time for the few lost souls?