From my experience, it's best if you start marketing yourself through social networks (facebook, twitter, linkedin, etc). I've tried "Google-ing" contacts who has related products and email them. Blog commenting, posting in PR sites and article directories are also helpful ways of marketing yourself. A colleague has advised that we can get advertising sales agencies to do the work for us. I think it's a good idea - takes off a few load from your hands. There are actually a lot of marketing and advertising agencies when you google.
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