Forum Moderators: open
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There are no stupid questions, only stupid answers! ;)
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For instance, if you wanted to list your site on Blue Widget directories, you could search for "Blue Widget" "add url" After you submit your site to the directories that turn up in that search, try "Blue Widget" "submit site" etc., etc...
DD, you've already asked that once [webmasterworld.com]
No need to post again, as the regulars all work the "recent posts" (see links top & bottom of page)
Mivox makes a good point as well: there is a lot of value to adding your site to topic specific directories.