It is good to try and submit your website to as many directories as possible. Not only do they advertise your site, however these sites also give you a much valued backlink. Providing you use the correct categories related to your site, and the website’s page rank is reasonable. (E.g. not 0-1 preferably).
Submitting to directories is very boring, you can use Firefox Autofill which does partly solve the problem, however there is a much better answer.
And It is FREE !! http://www.fastdirectorysubmitter.com/
This site allows you to submit to 100’s of directories with one single click, for most of the sites the only thing you have to do is enter the captcha code.
You have to spend a little time setting it up, and putting in as many descriptions for your site that you can think, this is so that the software can use random descriptions which makes them look more natural, theres is also an instruction video to get you on your way.
It’s worth trying.