While you're there, download their mass-submission Excel template. We've done the first two, except for the directories. Let's discuss directories now. Directories are different from Search Engines. They do not spider pages.
Humans review and decide what gets in.
Still the grand-daddy of directories. Again, the traffic will be decent, but less than what you drive through the free and paid engines. Won't bring much traffic. Ask Jeeves answers questions. And the directories are also easy to use.