Rosalind - 7:43 pm on Sep 29, 2007 (gmt 0)

At the moment a site link is added to DMOZ, the site clearly is trusted -- otherwise it would not be added. No obvious case there, either.

On the whole I agree with this statement. However, there is a case for adding nofollow in certain cases, when a link hasn't been re-reviewed by an editor in some time. We all know that links go bad, and that automatic checking isn't always enough. It might be a good idea to nofollow those links that haven't been revisited by an editor for a year or two, because they might have changed purpose.