Assuming you are talking about the general directories (not dedicated porn ones, which I tend to lump in with link lists):
If you mean paid submissions, tried that years and years ago, when I was really new to this and really green - waste of money, all you get is listed on piles of shit, no account directories.
If you mean buying software and doing it yourself - tried this too, it worked a bit for Google PR, most my sites went up by 1, but that's not a lot of use. And this was years ago, Google may have got cleverer and be able to filter out this type of spam (or worse, penalise you for it).
If you mean doing it yourself by hand, good luck - my experience with software submission showed that you gotta do several hundred a day, every single day, for this to work!
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