Directory Submissions service is one of the most important ways to build incoming links to a website from a related page. This can not only get your website a higher Google Page rank but also improve the SERP's. There are a few website which offer automatic directory submissions but experienced SEO's will tell you - nothing works as good as manual directory submission. What we do at Manual Directory Submission is submit your website to the most suitable category on the most appropriate page with a High Google Page Rank, thereby improving your sites ranking.
This is not a list of what it takes to make our top directory list. These are some of the factors that influenced our decision