I suspect the current numbers will pale in comparison with the stats by the time you, gentle reader, visit the site. The numbers also pale in comparison to Yahoo. Yahoo doesn't reveal the number of sites it lists or how many categories it stuffs them in. That's still true with the Open Directory Project. Of course, Yahoo has been around longer, has more users, and has had more opportunities to cultivate its listings.
Quality counts more than quantity.
The ODP encourages users to submit new site listings or, even better, become editors themselves. Editors have the ability to add and edit site listings and descriptions, recommending the best sites to the surfers that come across that category. If you become an editor of a category, and decide that you like it, you can sign up for more categories to make your mark elsewhere. One guy edits categories about video games and Dr. Pepper. Another editor, clearly a Renaissance man, maintains the Fishing, Insurance Forms, and Easter Apparel categories.