I have been working on a tool that will crawl your directory and subsequent crawl external links and check if they are parked or dead links. These links are than flagged for manual review. We are currently offering our service in beta and are currently working on additional filters that will detect MFA , affiliate, gambling and adult sites. Please visit the site at http://www.linkzd.com. You will need to be a member to add your directory to be crawled however you can check our filters without login by going to check link. I would love to hear suggestions and criticism so please do reply.