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The tag is: <meta name="ROBOTS" content="NOODP">
Either that, or at least adjust the algo to rank a site based on it's actual <title>/meta description and just use the ODP in the SERP (kinda like how Yahoo does with their directory listings in the SERPs)
I also like the idea of the SEs working together, as with NOFOLLOW
However, what matters more to most site owners is how the page is ranked, rather than their first amendment rights - I'm joking ;) - Does the NOODP tag affect rankings? Do we know that?
Using the mcdar tool and checking one of my sites I noticed 17 out of 55 DCs are not using DMOZ but rank the homepage fine, the others DC's don't rank the homepage for anything but the DMOZ company name (and maybe some variants).