Search engine marketing relies on good links coming in to your site. When you have a site published with original content you can often boost ranking by submitting the site to a directory. Before there were search engines there were directories. Before yahoo had search, it had a directory. A good directory ensures that your site has quality content before listing it, and it's why the link is so valuable. Here is a list of a few top directories:
Getting listed in DMOZ is quite difficult. It is considered to be an authority site, and a ranking there is sure to give your site more credit to search engines. I suggest noting down the date you submit the site, and not applying more than once every six months (yes it can take over a year to get in to DMOZ). Make sure your site is 100% complete with no broken links or coming soon pages. Make sure you have original content and choose a category that is relative to your web site. When writing a title use the web site or company name. Keep descriptions brief and to the point, fancy fails. Finally, do not submit to multiple categories. This is just a start. None of these directories will include a site without original content, so make sure that you have that first. If you would like to suggest a favorite free or paid directory or assistance in getting your site listed better, feel free to comment here or contact me at sales@cr-sg.com. Pura vida!