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The three-part tutorial extends itself to more areas than an automated newsletter. The first part really introduced you to lead generation—the process in which you collect information from prospective customers on whether they are interested in your content. MailChimp even rates your subscribers, based on how they interact with your e-mails and signup forms. The ability to tie this functionality into WordPress only empowers your site to grow, because you can use the same process for white papers or other valuable information that you'd like to exchange for site visitor information. The clearer the picture you can paint of your visitors, the better you'll be able to produce content that they will want to talk about and share with others.