Well PPC and paid advertising in general are obviously not free and don't seem to be working for you since you asked this question.
Unique content is link bait and is necessary to maintain a good steady flow of traffic to your site. As Forrest said, submitting to directories can help to kick start it. I can't recommend highly enough becoming a dedicated member of a community though - not only is it fun  but it helps to build up links to your site (i.e. via blog comments - not spamming, but when you are asked to input your web site).
I wouldn't go down the social bookmarking (reciprocal Diggs/Stumbles) route as it tends not to work for commercial purposes and may give out a negative view of your company to visitors - they may see it as spam.
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