During last year drupalsites.net was working steady with about 28,000 visitors and 150 new submissions and users per month. Where historically it could reach 4,000 listed sites late April this year, after The Big Cleanup currently we have a bit more then 3,000 sites listed and about 3,900 registered users.
It is nice to mention as well that last year the DrupalSites was featured a couple of times at Smashing Magazine, Lullabot and few other nice and popular sites, got it's place on Drupal.org and (quite crappy to be honest) booth at DrupalCon 2008 Szeded.
According to Google Analytics drupalsites.net currently accounts to (average per month):