Listing in Directories is one way of building links and can bring value to the site provided we make sure that the directories are credible and have authority in the eyes of the Search Engines. Google is said to prefer Directories that are human edited and that have very specific categories for listings ( e.g.Yahoo Directory).
Here are some points to keep in mind:
1. Does the Directory have a good Page Rank?
If the Directory has a low PageRank, it probably does hold much authority with Google.
2. Are Category Pages Indexed? To be more specific, is the category page you wish to be listed in indexed in Google?
If the category page that you wish to be listed in is not indexed in Google, then the page has no power to improve your site’s link popularity, because Google does not know about it, it cannot recognize that it is linking to you.
3. How Many Sites Are You Sharing the Link Juice Wealth With?
In most cases, an interior directory category page will contain ten listings – maybe twenty at the most.If the directory has too many listings on the same page, it may not be worth getting listed on there unless it is a proven source of traffic.
4. Does the Directory Add the NOFOLLOW Attribute To Its Listings?
If you are submitting to a directory to help improve your site’s link popularity and they are adding the nofollow attribute to outgoing links, it is not going to help you. Unless you are expecting to get some traffic from the directory, avoid it.
5. Will the Directory Send You Any Traffic?
It is worthwhile to keep a track of the traffice being received from a directory to decide whether it is reliable source of traffic for your website.