directories are ok, but that market is far to saturated. the best way is to use a social networking site, and message people on that, you can select your demographic - eg males aged 15-35 and send them a simple message telling them about some of the things that your site offers. try not to be too spammy though, cos most people will simply ignore the messages, but if you can get a 10% click through rate from that then you are on to a winner =)

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