Resume distribution services

Have you guys ever used a resume distribution service? If yes, how was the response? A Bunch of them show up when googled but I am not very confident about those sites. What would be the most effective way to reach out the headhunters? Does any one have a email/contact database or list

I have never used a resume distribution service, but what I have heard from those who have is that it usually backfires as it makes you look desperate. I would recommend a more targeted search.