I am sure that many of heard about link directories.
Link directories are a special kind of websites, designed to host huge lists of websites in a database and server it’s content via PHP. There are tons of web directories/link directories. Unfortunately many of these directories are nothing else than garbage because no one ever reviews a listing, the content of a listed websites and so on.
Basically, what is happening? There if you have a very good link directory submitter you can submit your websites with a few clicks to hundreds of web directories. Now, you have to consider that other people are also submitting to the same directories.
If this is what you are looking for, PHP Dir Submit is a good start point.