Just to add up into it. Directory submission has it's own way of being so useful for the site. I beg to dis-agree for those who says that Directory Submission cannot make to be backlink for our sites, of course this is a False believe, it just really depends on how does your directory listing will be popular or most know in that directory. Also consider the reputation of the Directory Submission site that you are going on, of course the more highly reputable site you wanted to list on, the more the possibility your listing will be more visited than on other site. Also consider going to premium listings and other offered that goes to offer by the directory submission site. Just want to say that Directory Submission site is very useful, if it will be used in the excellent way.