if you search this forum's past threads - then you find far more than 7000 directories published import them into a directory software to check for existing pages ( 404 check ) and update the PR of all directories. then make your manual choices which ones to submit to.
Manually is the best way to do directory submission. If you submit your site into appropriate category then that will be helpful to get your link in the listening s easily.If you want to do directory submission the site requires titles,URL,keywords,owner name,email and description is very attractive then will keep your link in their list.