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OddDog - 7:39 am on Oct 12, 2006 (gmt 0)
In the directory field the vast majority are general directories whos only value is a free seo friendly backlink. The actual value of that backlink is probably very very low, and if it is not, it will be in short order as the SE´s devalue those links. So we come to the what directories are worth it questions (worth it in you time and or the fee). To cut and paste from a recent blog post ... 1.Published editorial/submission guidelines. find a way to quantify these and I believe you have a way to list directories adequatly.
A couple of ideas from thedirecoryblog
2.Editors that stick to these published guidelines (aka editorial integrity).
3.Unique category structure (clearly if your a geographic directory thats near impossible)
4.Quality sites in the directory (whether submitted by site owners or included by an editor)*
5.Quality unique descriptions that help a visitor to understand what the site offers without having to click on the link.