Master Directory List
Search Directories (not to be confused with Search Engines, like Google) can be excellent sources for links. That's because search engines, like Google, tend to trust certain directory links, which tend to give your site a boost in the rankings. But which directores? ...our Ultimate Directory List provides THE list of Directories that can help your rankings.
Editor's Note - Although directory links have been reduced in importance within Google's algorithmic updates, they still have value. Specifically, the ones below and those that are niche or highly cultivated (like http://www.hotsaucenetwork.com/, if you sell hot sauce, you would want to be in this directory).
Be sure to read our guide: How to Evaluate a Directory Before You Submit a Site