The web design categories are most definitely moderated by web designers - but that's how Dmow (use to be Newhoo) was built - experts moderating.
I used to be a Dmoz moderator many many moons ago - it's a pain in the arse, the rules are massive and it's sometimes easier to refuse a site than explain why someone has to move it into a different category.
Plus, because it's unpaid, work tends to back up.
Then of course, the novelty wears off for a lot of people so they leave.
Web designers and SEO
people love being moderators bcos they can make sure their clients sites go where they want them to.
Mat, try drilling down big time and sumitting in the quietest category you can - so where do you live? Find that town/village, then Business Services then whatever you can - you're moer likely to get accepted.