Matt Cutts from Google webspam says don't waste your time with DMOZ:
http://www.youtube.com/watch?v=KCY5pbAuYpk&feature=player_embedded
http://www.youtube.com/watch?v=KCY5pbAuYpk&feature=player_embedded
Look on Fiverr!
There's an editor claiming to get your site onto DMOZ for $5... Doesn't guarantee results but for $5 it's worth a shot before spending $300!