victor - 6:11 pm on Sep 29, 2007 (gmt 0)

nofollow is for links the site owner does not trust.

The nofollow attribute was devised to address a spamming issue created after the invention of Google -- blog comment spam. DMOZ predates the creation of Google. So no obvious case there for DMOZ to use it.

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.

There may be a case for some of DMOZ's automated tools to downgrade a link to nofollow if it trips some automated internal checks -- rather than immediately delisting it. (the automated checks are run every few weeks to look for link rot and other degradations). But I can't off hand think of any examples where that would be useful.