Dmoz (The Open Directory Project/ODP) is a collection of manually edited directories that provide results or data for search engines. Most of these editors are volunteers, so getting a site listed in Dmoz is not an easy task; some sites may even take over a year to be indexed...
However, don't get discouraged, because being included in Dmoz is as significant as being added to Google. Many webmasters even consider being indexed by Dmoz more important than paying $300 annually for Yahoo's paid inclusion service.
Nowadays, most major search engines use Dmoz. This fact demonstrates that Dmoz is the most crucial submission target, which is why tens of thousands of websites spend months requesting Dmoz editors to add their sites to the directory. The ultimate benefit of being properly indexed by Dmoz is achieving better rankings on other search engines, which provides far more advantages than what you would gain solely from being listed on the Dmoz site (http://www.Dmoz.org).