The success of any online business depends in large part on where and how it's marketed. After all, a website sitting all by its lonesome in cyberspace isn't going to do much good; people have to be able to find it first! But that's only where it begins. Once your website is getting traffic, it's next job is to convert visitors into paying customers. From there, your job is to try to turn customers into repeat buyers or into a source of referrals. Here are four major types of marketing to inco.