If you want to significantly improve your site in the search engine result, submit your site to various directories. You can drive extra traffic for your website or blog by submitting your url to directories. Directories are used for general information on a broad topic.
Various subjects and topics are arranged categorically in a directory. Users of directories first search for a broad category then narrowing focus step by step. As for example a user searching for ‘breast cancer’ might first begin with the category ‘Health’, then the subcategory ‘cancer’ then ‘breast cancer’. Users skip to another if a directory does not give him satisfactory result.

Dmoz is one of the best directories which will help your site to make the biggest difference within a short span of time. Dmoz is a human edited open directory. Dmoz is constructed and maintained by a vast number of volunteer editors. You have to choose the right category to register your site with DMOZ. It is completely free. So submit your site to various directories and enjoy the magic change.The other important directories are as under:
http://www.looksmart.com
http://www.webbrain.com
http://www.yahooligans.com
http://www.ipl.org