lexipixel - 4:54 am on Nov 13, 2007 (gmt 0)

rigorous pre-qualifying questions on the input forms themselves

I use a bounce-back email verification as the first step, (person submitting needs to use a valid email address, receive the automated reply which contains a unique coded link and click it). That weeds out the form-bots and link spammers. Once submitted and bounceback verified, I manually check the submitted site to make sure it's appropriate for inclusion in the directory. I can delete any off topic listing with a single click, (but I usually send a friendly email telling them why it was deleted, e.g.- not in geographic area, not a good match for industry, links to "under construction" sites, etc).