When the World Wide Web was young - or at least younger than it is now, most of us found what we wanted on the internet through directories. The most well known is Yahoo. The information on the site is organized in categories and subcategories, eventually 'drilling down' to a backlink to the sites that fit the categories. Webmasters still use directory submission to drive traffic to their website. However, directory submission traffic is different than search engine traffic - and with different benefits.
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With directory submission, the process is a bit different. The internet user is, in effect, their own 'search engine.' They go to the directory site and choose the category of information they want, then continue to choose sub-categories until they arrive at the list of sites - all of them backlinks - that contain what they are looking for.
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The important thing to remember here is that directory submission is a technique that focuses on the quality of the visitor you receive - not the quantity. It will take some additional work to find the right directories for you, but in terms of targeted traffic it will be worth the effort.
When you look for directories to submit your website to, be sure that you assess them carefully first. Follow some of the category progressions to make sure that they make sense. Going from 'education' to 'diet pills' is not the kind of category progression you want. Make sure it's logical and that sites with irrelevant content are not listed in a category where they don't belong. This would only create lousy backlinks, making search engines - and worse, visitors - leery of following the directory's backlinks.