Advice for getting accepted as an editor
Actually it is completely possible that one wouldn't get an e-mail if their application to be an editor was denied. Sending a rejection letter is the meta's choice. My best advice to you at this point, is to read the editor guidelines, a public document, that can help you learn what we're looking for in a description. You can find that document here: http://dmoz.org/guidelines.html . It's quite long, the most relevant section for someone just looking to become an editor is the "Describing Sites" section. My other advice is to only apply for a category with less than 100 sites. Sometimes new editors are accepted to larger areas, but sticking under 100 sites in that first category is a big plus.
Lastly, since you submitted your site to that category, be sure to be completely honest about that fact, and perhaps supply 2-3 URLs other than your own to show us that you're interested in helping the directory not just your site. /images/icons/wink.gif
Goodluck! And don't hesitate to apply again at this point.