If you are one of the extremely fortunate webmasters that gets a link from DMOZ. Consider yourself lucky and privileged. If you are luckier still, an experienced editor may appoint a good title and description of your website. If you are extremely lucky, the editor will have placed your link into an inappropriate category. Where none of your competitors are listed. Don’t expect the link to be of any more value than a normal link. What you do is to promote the page your link is on within DMOZ. The more links that point to that page, the more value will eventually bounce off that page to your website. Google is not efficient in defining themes and topics. The irrelevant page is good. Promote that page and you have a good value link. Use your keyword anchors to point to the DMOZ page. Use a mixture of your keywords. The page will benefit from inbound links to eventually make it rank high. Once it shows in the serps, for your keyword, you know you have a good link. Even though it might rank above your website. The trick here is to promote the pages your inbound links are in. As with any page, it is a unique URL. A directory contains categories with maybe 50 links in it. But that page in DMOZ may not have any external links pointing to it. Making it a useless page to have a link in. The mere fact that it resides at DMOZ means little. Consider the page your link is in DMOZ to be your personal website. Promote it as you would your website. Give it life within search engines and that link will become a good link. It might even be a good idea to adopt the page to within the navigation of your website. After all, it is a page that has your link in it. Make it part of your website. Promote it. The link in there points to your site. Think of the DMOZ page as an extension of your menu. It is an external extention of your menu after all. If you want to go to the extreme, repetitive submissions to search engines and directories to maintain as wide a link back to the DMOZ page is another alternative to push the limits. Since google is highly unlikely to ban the DMOZ page, your link will get the highest possible exposure to google. The worst case scenario of such an extreme measure is that google falters and inadvertently considers the DMOZ page as belonging to the hundreds of temporary status codes inflicted on that page. No harm will result in your website other than the DMOZ page where your link will still be good but of little value. A risk well worth taking for the adventurous. Automated submission software exists to do this job. You will have also helped other links on that page. Do not believe google when it says a webmaster cannot influence the ranking of another website. You can. Positively and detrimentally. Good luck.
It would be better to spend that effort on your own site...especially since an editor can move your site or delist you at any time for any reason...or for no reason at all...
I lost two listings in one day. Casualties, I've curtly been told, of a Robozilla 404-rampage. Back in the queue for several earthspins 'round the sun.