Not every site submitted to the dmoz will get listed. To get in, your site has to provide something that the other sites listed already do not provide. There has to be something about your site that makes it worth listing.
Add to this the fact that the editors are all volunteers and that many categories are vastly over subscribed and will never get the editors attention.
For more info on dmoz, look at http://www.resource-zone.com/forum/index.php?