Weather it is promotion for your websites or it is promotion of your own web directory. Web directories are the best way to get listed and have some exposure in the searchable categories.
I have always been kick starting my website promotion by submitting it to directories and getting traffic from it. If serious directories are chosen then the marketing efforts never goes in vain. A quality web directory has some features like it is monitored by a human or a group of them, assuring the quality and effectiveness of the shown results. This thus provides the most appropriate sites that the visitors are looking for. Giving you a more then just traffic – targetted traffic.
So remember when you choose the directories that you want to get listed on. Keep it sure and simple. Human edited web directories with good maintained directory index is the place to get listed on.