DMOZ or the ODP (Open Directory Project) is a very large directory of websites owned by AOL and run by volunteers. It is or was widely believed that DMOZ is a web directory that the search engines give special weight to if a site is listed there and rank it higher in the search engines. That may have been the case in the past, but is debatable if that is the case today or not. As its did or might still carry some weight, all webmasters want to get listed there and if they don’t they complain loudly in webmaster and SEO forums will all sorts of silly allegations of corruption amongst the editors and favoritism etc.
So what do so many do to try and get listed? Rather than follow the guidelines, they SPAM! They just keep on resubmitting the site on a regular basis in a hope to get the attention of the editor in a category. The problem is, resubmitting just overwrites the old submission with the new date, so they keep moving the site to the back of the queue for the editor to review it. If they submit too many times too often, DMOZ will just block the site all together, so the spamming does not pay.
The guidelines are clear. They say to only submit once to the one best category. Doing anything ore than that is not going to work or be productive. Here is some good advice and how to get listed in DMOZ.
However, we all know that spammers never read, let alone understand the guidelines that they agreed they had read and understood.