good way to build backlinks and get faster indexed. I myself let places find me naturally thoug my site was indexed in a day.
Directories are well respected by the search engines, especially the likes of Dmoz, it means that your site has been manually reviewed and placed in the appropriate category, hence why backlinks from Dmoz are very prized
Directory submission is the best way to getting back links as well as good traffic. it's one way linking process and also free and PR related website are available. it's really good for SEO.
In Google's eyes, Yahoo! directory and DMOZ are very important directories. It will take several months for these directories to index your site.