SEO has so many techniques and methods to promote any site. Time consuming techniques also available here for promotion of any site, but most important thing is that your submission has some worth or not?
 Directory submission has some advantages. It is not time consuming and it is easy to use. Other way it has so many benefits. This is the method in which we will get good back links for our site. It is very important for new site. If you will use this method your site will be definitely crawled by search engine with in two three days. It is really true in practically that directory submission never gives you good traffic, but it is important in terms of increasing the back links of any site. If you will use some good directory which has good Page Rank and good value in search engine, you will definitely get the full advantages of this method.
 Some web masters and site owners doing lots of submission in lots of directories of a single site. This is very bad practice and you can be banned in Google. Working in all SEO channels is good practice but if you are working in only one channel and promoting your site through one channel it looks like spam. Be ware with spamming and try to do valuable submissions in SEO.
 Directory submission also has some category. Free, paid and reciprocal. You can choose which you can afford. I think the best way is to promote your site in free directories because it creates awesome impact on search engines. Using the title of your site in the directory submission form is very good practice and you must adopt this thing in your submissions. Always be away from the banned directories. Twice check the index pages of the directory in search engines and after that start your submissions. If you will follow these guidelines you will definitely get the advantages of this method.