1st Search
List here to help your site be found by other search engines. This is strictly a positional play since the directory is not really useful. Easy to add your site.

1st Spot
Good overall breadth of listings. Click down to the category you want to be in. Adding sites is simple. Posts are done quickly.

100 Hot.Com
Very limited directory which makes a site hard to place. They use Metacrawler for their searches so the question really becomes the overall value of this site. Submit it to help with your overall popularity but don't expect much else. You must have your own domain name.

2Look4It
A newer directory allowing you to post your site in up to three categories. Posts are usually done quite quickly so this is worthwhile the effort. Tailor your description to ensure that you use appropriate keywords for searches. Overall, not a bad effort even though the site is a little cluttered.

2Ants
Good overall quality of sites within the index which is fairly well designed. Posting is done fairly quickly. Go to the category you want your link in and then add your site.