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For YC Readers: who have built a good website that nobody visits.
I just came across the article "How to Market Products That Are No Longer Popular", though it is specifically not for web products but it could be helpful to YC readers who have built wonderful websites but lack visitors, the fundamentals of selling any products (and making it popular) are the same and this article is worth reading it.
Article: http://knowledge.wharton.upenn.edu/article.cfm?articleid=1950