On Monday I told you how to write content that will bring traffic to your site. Yesterday I told you how to use newsletter marketing to keep in touch with your customers and to turn on-the-fence visitors into customers. Both of those are pretty easy to do with a content management system like WordPress. Today I want to tell you about a piece of functionality that's much harder to implement but is so incredibly vital to e-commerce that all of the top 10 e-commerce sites on the Internet use it. I'm going to talk to you about intelligent product recommendations, the kind you see all over Amazon.com.